Wireless Key Detection with Dual Range Fallback
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Solution Overview
Problem
Existing vehicle systems that use wireless keys for unlocking and starting motor vehicles without a physical key can be inconvenient for drivers when temporary errors or short-term disruptions occur, requiring the key to be manually moved into a smaller detection range for fallback detection, which can be uncomfortable and inefficient.
Innovation Solution
The method involves maintaining the first detection device active in parallel with the second detection device during search processes, allowing for simultaneous or alternating searches without requiring the key to be moved into the second detection device's range for temporary errors, and permanently switching to the second detection device if a longer-lasting fault is detected, such as an empty key battery or system failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a first detection device with large detection range is used for wireless key detection, then the detection coverage is improved, but the system reliability deteriorates when temporary errors or short-term disruptions occur
Solution Approach 1:
The detection system is segmented into two distinct detection devices: a first detection device with large detection range for normal operation, and a second detection device with small detection range for fallback operation. This segmentation allows each device to be optimized for its specific function and provides redundancy when the primary device fails.
Solution Approach 2:
The system prepares for potential failures by having a second detection device ready as a cushion against system failures. When the first detection device experiences temporary errors or disruptions, the system automatically switches to the second detection device, providing a safety cushion that maintains operational reliability.
2Reliability
If a second detection device with small detection range is used as fallback, then the system reliability is improved, but the ease of operation deteriorates as the key must be manually moved into the smaller detection range
Solution Approach 1:
The system performs self-service by automatically detecting when the first detection device fails and autonomously switching to the second detection device without requiring user intervention. The control unit monitors the detection status and automatically manages the fallback process, eliminating the need for the driver to manually move the key.
Solution Approach 2:
The system dynamically adapts its detection strategy based on real-time conditions. When temporary errors are detected in the first detection device, the system dynamically switches to the second detection device. The switchability is temporary and automatic, allowing the system to return to the first device when it becomes operational again.
3Reliability
If the system permanently switches to the second detection device when the first fails, then the reliability is improved, but the loss of time increases due to permanent fallback mode
Solution Approach 1:
The system implements a dynamic switchability mechanism where the transition between detection devices is temporary rather than permanent. When the first detection device fails, the system switches to the second device for a predetermined period. If the first device becomes operational again within this period, the system automatically switches back, avoiding permanent fallback and minimizing time loss.
Solution Approach 2:
The system employs periodic checking of the first detection device's operational status during the fallback period. At predetermined intervals, the system attempts to re-establish communication with the first detection device. This periodic action allows the system to efficiently transition back to the primary device when conditions permit, reducing overall time loss.
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
This approach enhances driver comfort by minimizing the need to manually position the key and ensures continued vehicle operation by adapting the search strategy to vehicle conditions, reducing the likelihood of errors and improving overall system reliability.
Implementation Method 1
a first detection device for a wireless key, which operates via radio waves
Implementation Method 2
the second detection device can comprise a transponder coil that stimulates a second transponder of the key
Data Source
Figure 1~2
AI summary
The invention relates to a method for operating a motor vehicle (1) having a first detection device (5) operating by means of radio waves for a wireless key (2) and a second detection device (6) for the key (2), which second detection device has a smaller detection range than the first detection device (5). After a control element (8) for switching the motor vehicle (1) on and/or off has been actuated, a searching process is performed by means of the first detection device (5) and, if no key (2) associated with the motor vehicle (1) was found by the first detection device (5), a searching process is performed by means of the second detection device (6) from a fallback time, wherein the first and the second detection devices (5, 6) perform a searching process in parallel at least at times or in alternation from the fallback time.