Vehicle Access Device Adaptive Signal Frequency Control
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Solution Overview
Problem
Passive access devices for vehicles consume high power due to the frequent emission of interrogation signals for determining the position of mobile identification transmitters, leading to increased power consumption in both the vehicle and the transmitter.
Innovation Solution
An access device with a vehicle-side control device that adjusts the frequency of localization signal emission based on the position, distance, and duration of the mobile identification transmitter's presence, reducing power usage without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interrogation signals are emitted at short time intervals to ensure smooth operation of the passive access device, then the reliability of position determination is improved, but the power consumption in both the vehicle and the mobile identification transmitter increases
Solution Approach 1:
The patent applies dynamics by making the emission frequency of localization signals adaptive rather than static. The control device dynamically adjusts the time interval between successive localization signals based on the detected position of the mobile identification transmitter. When the transmitter is close to the vehicle, shorter intervals are used for reliable authentication; when far away, longer intervals reduce power consumption. This dynamic adjustment resolves the contradiction between maintaining reliable position determination and minimizing energy usage.
Solution Approach 2:
The patent changes the parameter of signal emission frequency based on the distance parameter. The control device determines the position of the mobile identification transmitter and adjusts the time interval between localization signals accordingly. This parameter change strategy allows the system to optimize the balance between authentication reliability and power consumption by adapting the emission frequency to the actual operational context.
2Measurement precision
If the frequency of localization signal emission is increased to improve position determination accuracy, then the measurement precision is improved, but the power consumption increases
Solution Approach 1:
The patent implements parameter changes by adjusting the emission frequency of localization signals based on the detected position of the mobile identification transmitter. The control device uses a position-dependent strategy: when the transmitter is detected at a distance requiring high measurement precision (close to the vehicle), the emission frequency is increased; when the transmitter is far away, the emission frequency is reduced. This resolves the contradiction between maintaining position determination accuracy and minimizing vehicle power consumption.
Data Source
AI summary
An access apparatus (ZV) for a vehicle (FZ) has a vehicle-side position-determining device (PBE) for determining the position (POS1, POS2, POS3) of a mobile identification signal generator (IDG) with respect to the vehicle. In addition, said access apparatus (ZV) has a vehicle-side control device (STE) for emitting location-determining signals (LS1) to the mobile identification signal generator (IDG) for determining the position thereof. In this context, the vehicle-side control device (STE) is configured to control the frequency of the emission of the location-determining signals as a function of the position of the mobile identification signal generator with respect to the vehicle. In this way, the power consumption both in the vehicle and in the identification signal generator can be reduced on the basis of the location-dependent adaptation of the emission of the interrogation signals, without adversely affecting reliable operation of the access apparatus.