Vehicle Remote Receiving Circuit Multiplexer Antenna Detuning
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Solution Overview
Problem
Conventional resonant circuit drivers for keyless vehicle access and start systems face challenges in achieving efficient and cost-effective reception of the self-generated response of a Charge&Talk transponder on multiple antennas, often resulting in reduced signal sharpness and limited range due to detuning of the resonant frequency and high energy consumption, while also failing to comply with radio approval regulations and electromagnetic compatibility guidelines.
Innovation Solution
The proposed solution involves a receiving circuit with a multiplexer and controllable switches integrated into an IC, allowing for bidirectional communication and efficient use of multiple antennas, including a discharge switch to manage antenna resonant circuits, and adjustable capacitance and resistance components to optimize signal reception and compliance with regulatory standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a high quality factor is used in the resonant circuit to minimize energy consumption, then energy consumption is reduced, but transmission data rate is restricted
Solution Approach 1:
The system dynamically switches between resonant mode (for energy efficiency) and non-resonant mode (for data rate). The resonant circuit is activated only when energy conservation is prioritized, while it can be deactivated or detuned when higher transmission data rates are required, allowing the system to adapt its characteristics based on operational requirements
Solution Approach 2:
The patent changes the operating parameters of the resonant circuit by adjusting the quality factor and resonant frequency. By controlling the detuning of the resonant frequency relative to the carrier frequency, the system can optimize between energy consumption and data transmission rate, achieving a flexible balance rather than being constrained to a fixed high quality factor operation
2Use of energy by moving object
If exact frequency tuning is performed to minimize current consumption, then energy consumption is reduced, but system complexity increases
Solution Approach 1:
The system employs automatic frequency tuning and tracking mechanisms that self-adjust the resonant circuit parameters without requiring manual intervention. The circuit automatically locks onto the carrier frequency and maintains optimal tuning, reducing the complexity of manual adjustment while preserving energy efficiency benefits
Solution Approach 2:
The patent uses electronically controllable parameters such as variable capacitors or inductors that can be adjusted through software or control circuits. This allows for programmable frequency tuning and automatic tracking, reducing mechanical or manual tuning complexity while maintaining precise frequency control for minimal current consumption
3Use of energy by moving object
If the resonant frequency is detuned relative to the carrier frequency, then energy consumption is reduced, but signal reception sharpness is reduced
Solution Approach 1:
The system dynamically adjusts the degree of detuning based on operational requirements. During reception phases, the resonant frequency can be tuned closer to the carrier frequency for sharp signal reception, while during transmission or idle phases, greater detuning can be applied to reduce energy consumption, creating a time-varying optimization strategy
4Reliability
If multiple antennas are used for keyless access system, then communication reliability is improved, but system complexity and cost increase
Solution Approach 1:
The patent combines multiple antenna resonant circuits into a shared system with common control and processing resources. Multiple antennas are integrated with a single microcontroller, shared power management, and unified signal processing architecture, reducing the overall system complexity and cost while maintaining the reliability benefits of multiple antennas through coordinated operation
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 enables efficient and cost-effective use of multiple antennas for keyless vehicle access and start systems, improving signal reception quality, reducing energy consumption, and ensuring compliance with radio approval regulations and electromagnetic compatibility guidelines, while allowing for rapid system readiness and flexibility in installation.
Implementation Method 1
an inductive antenna is predominantly used as an antenna for emitting the LF signal
Implementation Method 2
The key contains a transponder (TRANS) operated without a battery because it obtains its energy for supply from the low-frequency magnetic field and stores it
Data Source
AI summary
The present disclosure teaches a receiving circuit for use with a vehicle and serving for receiving a signal of a transponder. The receiving circuit may include a plurality of input paths each having an antenna and a multiplexer with a plurality of switches controlled by control signals and connecting at least one of the input paths to at least one further device in the form of a discharger and/or detuner and/or amplifier.