Dual-Mode Transponder Switching Between Load Modulation and Active Transmission
Solution Overview
Problem
Conventional transponders are limited to supporting either load modulation or active transmission, requiring separate equipment for maintenance and communication, which is costly and inefficient, as different circuitry is needed for each mode, leading to the need for new diagnostic tools or key replication devices to interface with immobilizer systems using active transmission protocols.
Innovation Solution
An integrated circuit device that includes both a load modulation module and a current source, along with a command interpreter, allowing the transponder to switch between load modulation and active transmission modes based on received commands, enabling communication with both legacy and modern base stations using a single transponder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transponder is designed to work with C&T base station using active transmission, then communication range is extended, but it cannot communicate with legacy LM base stations
Solution Approach 1:
The transponder is designed with dual transmission capabilities, incorporating both load modulation module (for legacy compatibility) and active transmission module with current source (for extended range). The command interpreter enables the transponder to select the appropriate transmission mode based on the base station type, making it universally compatible with both legacy LM and modern C&T base stations
2Reliability
If separate equipment is used for legacy LM and modern C&T systems, then each system operates optimally, but maintenance costs and infrastructure requirements increase
Solution Approach 1:
The transponder incorporates both load modulation and active transmission capabilities in a single device, allowing service centers to use existing legacy equipment for maintenance while also supporting modern extended-range systems. This eliminates the need for separate diagnostic tools and key replication devices for different transmission modes
3Adaptability or versatility
If a transponder uses load modulation mode, then it maintains compatibility with legacy systems, but communication range is limited
Solution Approach 1:
The transponder dynamically switches between load modulation mode and active transmission mode based on the communication requirements and base station type. The command interpreter detects the base station mode and activates the appropriate transmission module, allowing the transponder to adapt its communication range and method in real-time
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
Enables a single transponder to support both load modulation and active transmission, reducing the need for new equipment and allowing service centers to maintain vehicles using existing load modulation equipment, while also interfacing with modern immobilizer systems using active transmission, thus reducing costs and infrastructure changes.
Implementation Method 1
the load modulation module is activated to provide a signal for transmission by modifying an incoming carrier wave through the load modulation module
Implementation Method 2
the current source is activated to provide a signal for transmission by generating pulses of current
Implementation Method 3
a resonant circuit serving as an antenna
Data Source
AI summary
A transponder is disclosed. The transponder includes a resonant circuit serving as an antenna, a load modulation module coupled to the resonant circuit, a current source coupled to the resonant circuit and a command interpreter configured to interpret a received initialization command. The command interpreter is configured to monitor input communication for a stop command signal and a charge & talk bit and if the charge & talk bit is not received within a predetermined time interval after receiving the stop command signal, the load modulation module is activated to provide a signal for transmission by modifying an incoming carrier wave through the load modulation module. If the charge & talk bit is received within the predetermined time after receiving the stop command signal, the current source is activated to provide a signal for transmission by generating pulses of current.