Radio Transmitter Frequency Control for Vehicle Communication
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Solution Overview
Problem
Conventional radio transmitters face challenges in adjusting transmission output power accurately, particularly in systems like passive entry and tire pneumatic pressure monitoring, due to variations in vehicle shape and antenna frequency response characteristics, leading to inefficient communication.
Innovation Solution
A radio transmitter that modulates a carrier wave using a frequency changing section to adjust transmission output power by changing the frequency to resonance frequencies or their harmonics, and a duty setting section to adjust the duty cycle of the waveform, allowing for precise control of transmission power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission output power is increased to ensure communication with target sensor units, then communication reliability is improved, but harmful interference to other sensor units increases
Solution Approach 1:
The transmitter dynamically adjusts transmission output power based on communication conditions. The control unit monitors communication status with sensor units and adjusts the power level in real-time to maintain reliable communication while minimizing interference to other units. This dynamic adjustment resolves the contradiction by adapting power levels to specific operational contexts rather than using fixed high power.
Solution Approach 2:
The system implements feedback control where the control unit receives communication status information from sensor units and adjusts transmission output power accordingly. This feedback mechanism allows the transmitter to optimize power levels based on actual communication conditions, ensuring sufficient power for target units while reducing power when interference risk exists.
2Object-generated harmful factors
If transmission output power is decreased to reduce interference, then harmful factors are reduced, but communication reliability with target units deteriorates
Solution Approach 1:
The transmitter dynamically adjusts transmission output power based on communication conditions. The control unit monitors communication status with sensor units and adjusts the power level in real-time to maintain reliable communication while minimizing interference to other units. This dynamic adjustment resolves the contradiction by adapting power levels to specific operational contexts rather than using fixed high power.
Solution Approach 2:
The system implements feedback control where the control unit receives communication status information from sensor units and adjusts transmission output power accordingly. This feedback mechanism allows the transmitter to optimize power levels based on actual communication conditions, ensuring sufficient power for target units while reducing power when interference risk exists.
3Reliability
If transmission output power is adjusted for each vehicle model, then communication reliability is improved, but device complexity and adjustment time increase
Solution Approach 1:
The transmitter performs self-adjustment of transmission output power through automatic detection and control. The control unit automatically monitors communication conditions and adjusts power levels without requiring manual intervention or complex pre-programming for each vehicle model. This self-service capability simplifies the system while maintaining high communication reliability across different vehicle configurations.
Solution Approach 2:
The transmitter dynamically adjusts transmission output power based on communication conditions. The control unit monitors communication status with sensor units and adjusts the power level in real-time to maintain reliable communication while minimizing interference to other units. This dynamic adjustment resolves the contradiction by adapting power levels to specific operational contexts rather than using fixed high power.
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 easy and accurate adjustment of transmission output power, improving communication efficiency by reducing the impact of varying antenna frequency response characteristics and allowing for stable communication across different vehicle models.
Implementation Method 1
changes the frequency of the carrier wave to one of the resonance frequency f1 and a frequency f1×1/n (n: a given integer of not less than 2) to change transmission output power
Data Source
AI summary
A radio transmitter for modulating a carrier wave in a predetermined frequency with given information to transmit the modulation signal through an antenna having a predetermined resonance frequency f1 has a frequency changing section that changes the frequency of the carrier wave. The frequency changing section changes the frequency of the carrier wave to one of the resonance frequency f1 and a frequency f1×1/n, (wherein n is a given integer of at least 2, to change transmission output power.