Smart Key Polling Signal Timing Offset for Noise Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing smart key systems face challenges in reducing noise interference while maintaining user convenience and battery lifespan, as they often require waiting for multiple signal transmissions and constant noise detection, leading to increased power consumption.
Innovation Solution
A smart key system with a vehicle-mounted unit that adjusts the polling signal transmission timing by a predetermined time shorter than the cycle when certification is not completed, allowing the portable device to differentiate the signal from noise and reducing unnecessary power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission timing of the polling signal is offset to avoid noise overlap, then the polling signal can be received well, but the user's convenience is lowered due to repeated waiting
Solution Approach 1:
The patent applies dynamics by making the transmission timing of the polling signal adjustable rather than fixed. The control unit dynamically changes the transmission timing based on whether certification is completed, switching between normal timing and offset timing to adapt to different operational states and resolve the contradiction between reliability and user convenience
Solution Approach 2:
The patent changes the transmission timing parameter of the polling signal based on certification status. When certification is not completed, the transmission timing is offset by a predetermined time, which changes the temporal parameter to avoid noise overlap and ensure reliable signal reception without affecting normal operation
2Reliability
If the portable device always maintains noise detection capability, then noise can be detected and avoided, but the consumption current increases and battery lifespan decreases
Solution Approach 1:
The patent implements periodic action by having the vehicle-mounted device perform certification processing at regular intervals rather than requiring the portable device to continuously detect noise. The polling signal is transmitted periodically, and certification is attempted at each interval, allowing the portable device to conserve energy while still achieving reliable communication
Solution Approach 2:
The patent applies self-service by having the vehicle-mounted device perform certification processing using received signals rather than requiring the portable device to actively detect and analyze noise. The vehicle-mounted device serves itself by processing certification based on the polling signal and reply signal exchange, reducing the energy burden on the portable device
Data Source
AI summary
A smart key system includes a first transmitting unit, a first receiving unit, and a certification unit that are mounted on a vehicle, and a second receiving unit and a second transmitting unit that are mounted on a portable device. The certification unit performs certification processing of the portable device when the first receiving unit has received a reply signal. The first transmitting unit transmits the polling signal at a transmission timing that is later or earlier than a transmission timing based on the polling signal before the predetermined manipulation is performed, by a predetermined time shorter than a predetermined transmission cycle, when the predetermined manipulation has been performed in a situation where the certification unit does not certify the portable device.