Variable Pull-Up Resistor for Steering Remote Control Voltage Adaptation
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Solution Overview
Problem
Vehicle-mounted devices, such as car navigators or audio equipment, are not universally compatible with steering remote controls due to voltage differences between manufacturers, requiring adapters to function properly.
Innovation Solution
A vehicle-mounted device with a voltage detector and a variable pull-up resistor that detects and adapts to the output voltages of different key switches on a steering remote control, allowing the device to identify and operate with various remote controllers without the need for additional adapters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a steering remote control outputs preset signals with fixed voltage values for genuine vehicle-mounted devices, then the genuine device can be operated, but the remote control cannot work with commercially available vehicle-mountable devices due to voltage differences
Solution Approach 1:
The pull-up resistor is made variable rather than fixed, allowing its resistance value to be dynamically adjusted based on the detected voltage level. This enables the system to adapt to different voltage output characteristics of various remote controllers while maintaining reliable signal detection through optimal resistance matching.
Solution Approach 2:
The resistance value of the pull-up resistor is changed as a variable parameter to match different voltage output characteristics of remote controllers from different manufacturers. By adjusting this parameter, the system achieves compatibility with multiple device types while preserving detection accuracy through optimized electrical characteristics.
2Adaptability or versatility
If an adapter is used to convert signals from steering remote control to vehicle-mounted device, then compatibility is achieved, but device complexity increases
Solution Approach 1:
The signal conversion function that previously required a separate adapter device is extracted and integrated directly into the vehicle-mounted device's detection processor. This eliminates the need for external adapter hardware while maintaining compatibility capabilities through the variable pull-up resistor and adaptive detection algorithm.
Solution Approach 2:
The adapter's signal conversion functionality is merged with the vehicle-mounted device's existing detection circuitry. The variable pull-up resistor and adaptive detection logic are combined within the detection processor, creating an integrated solution that provides compatibility without requiring separate adapter components.
3Measurement precision
If the pull-up resistor has a fixed resistance value, then the circuit structure is simple, but identification errors increase when dealing with different remote controllers
Solution Approach 1:
The pull-up resistor transitions from a static fixed-value component to a dynamic variable-resistance element that can be controlled to assume different resistance values. This dynamic adjustment capability enables precise adaptation to various remote controller voltage characteristics, significantly improving key switch identification accuracy while the control mechanism remains integrated within the detection processor.
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 seamless operation of vehicle-mounted devices with steering remote controls from different manufacturers, reducing identification errors and eliminating the need for adapters, thereby enhancing compatibility and precision.
Implementation Method 1
a voltage detector 22 configured to detect through the input port an output voltage output from the remote controller
Implementation Method 2
a pull-up resistor connected in series between the input port and a power supply supplying a voltage to the remote controller, the pull-up resistor having a variable resistance
Data Source
AI summary
A voltage detector 22 has an input port IN connectable to a steering remote control 6 of a voltage dividing type adapted to output one of output voltages different from each other for each of key switches to be pressed by a user, and detects through the input port IN an output voltage output from the steering remote control 6. A pull-up resistor 21a is connected in series between the input port IN and a power supply Vdd supplying a voltage to the steering remote control 6, and has a variable resistance. A controller 23 controls the pull-up resistor 21a to have sequentially changed resistances in a course of pressing the key switches. A processor 3 operates on sets of output voltages given respectively for the resistances in the course of pressing the key switches, to select a resistance of the pull-up resistor.