On-Vehicle Smart Key Noise Adaptation
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Solution Overview
Problem
In smart key systems, establishing communication between a portable device and an on-vehicle device is challenging due to the portable device potentially entering a state where it cannot receive signals, leading to failed connections, especially in noisy environments.
Innovation Solution
The system includes an on-vehicle electronic device that creates a wake-up signal to help the portable device enter a reception state and designates the number of times to transmit an encrypted communication code based on noise conditions, allowing for increased retry attempts without increasing the number of wake-up signal transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the portable device enters a reception state for a longer period to receive encrypted communication codes during noisy conditions, then the reliability of communication establishment is improved, but the power consumption increases and battery life degrades
Solution Approach 1:
The portable device dynamically adjusts its reception state duration based on noise detection. When noise is detected in the communication environment, the device extends its reception state period to ensure reliable reception of encrypted communication codes. When no noise is detected, the device uses a shorter reception period, thereby reducing power consumption. This dynamic adaptation resolves the contradiction between reliability and energy usage.
Solution Approach 2:
The system changes the time parameter (reception state duration) of the portable device based on environmental noise conditions. The control unit detects noise levels and adjusts the reception period accordingly, transforming a fixed parameter into a variable one that adapts to conditions, thus improving reliability when needed while minimizing energy consumption during normal conditions.
2Reliability
If the on-vehicle device increases the number of retry transmissions for encrypted communication codes, then the communication establishment frequency is improved, but the time required for communication setup increases
Solution Approach 1:
The on-vehicle device dynamically adjusts the number of retry transmissions based on noise detection. When noise is detected, the device increases the number of retry attempts to ensure successful communication establishment. When no noise is detected, the device uses fewer retries, thereby reducing the overall communication setup time. This dynamic adjustment resolves the contradiction between establishment frequency and setup time.
Solution Approach 2:
The system changes the transmission retry count parameter based on environmental noise conditions. The control unit monitors noise levels and adjusts the retry number accordingly, making the retry parameter adaptive rather than fixed, thus improving communication reliability when necessary while minimizing time loss during normal conditions.
3Device complexity
If the portable device maintains a fixed reception waiting period, then the device complexity is reduced, but the communication establishment reliability decreases in noisy environments
Solution Approach 1:
The portable device implements dynamic reception waiting period adjustment based on noise detection. The control unit monitors the communication environment and extends the reception waiting period when noise is detected, ensuring reliable reception of encrypted codes. When no noise is present, the device uses a standard shorter period. This dynamic approach maintains relatively simple device architecture while significantly improving reliability in noisy environments.
Data Source
AI summary
An on-vehicle electronic device creates a first signal and a second signal, and designates the number of times of transmitting the second signal. When noise is generated, the first signal includes information indicating a period of time to receive a signal by the portable device longer than that when noise is not generated. When noise is generated, the number of times of transmitting the second signal to a portable device by the on-vehicle electronic device to be designated is larger than that when noise is not generated. For the period of time to receive a signal indicated by the first signal, the portable device receives a signal.