Vehicle Apparatus Voltage Control via RLC Parameter Feedback
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Solution Overview
Problem
Existing voltage control methods for motor vehicle apparatuses using pulse width modulated signals often result in incorrect pulse widths due to manufacturer errors, electrical connection losses, or changes in resistance, inductance, and capacitance over time, leading to potential damage from excessive or insufficient input current.
Innovation Solution
A method and electronic control unit that measure and calculate the actual resistance, inductance, and capacitance values of an RLC circuit model, comparing them to stored values to detect drifts and initiate actions such as modifying pulse width or generating alerts to prevent failures, and storing calculated values for diagnostic purposes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pulse width modulated signals are used with predetermined pulse widths based on manufacturer specifications, then the control system is simple and easy to implement, but the control accuracy deteriorates due to incorrect manufacturer data, electrical connection losses, or parameter drift over time
Solution Approach 1:
The control unit continuously measures the actual current strength and voltage at the apparatus terminals, then uses this feedback information to recalculate the RLC parameters and adjust the pulse width in real-time, resolving the contradiction between simple control implementation and accurate voltage control
Solution Approach 2:
Instead of using fixed predetermined pulse widths, the system dynamically changes the pulse width parameter based on recalculated RLC values, adapting to parameter drift and electrical connection variations while maintaining control simplicity through automated adjustment
2Device complexity
If the pulse width is not adjusted according to actual RLC parameter variations, then the control system remains simple, but the reliability deteriorates due to excessive or insufficient input current that may damage the apparatus
Solution Approach 1:
The control unit performs self-diagnosis by automatically measuring current and voltage, recalculating RLC parameters, and adjusting pulse width without external intervention, thereby improving reliability while keeping the control system architecture simple
Solution Approach 2:
The system performs preliminary measurement and calculation of actual RLC parameters before executing the control operation, ensuring reliable voltage control from the start while maintaining simplicity through integrated measurement and control functions
3Ease of manufacture
If manufacturer specifications are used without verification, then the initial setup is straightforward, but the manufacturing precision deteriorates due to incorrect resistance, inductance, and capacitance values
Solution Approach 1:
The system performs preliminary measurement of actual RLC parameters during initial operation and stores these calibrated values for future use, combining ease of setup with improved parameter accuracy through automatic calibration
Solution Approach 2:
The system continuously verifies and updates RLC parameter values based on measured current and voltage feedback, ensuring manufacturing precision is maintained and improved over time while keeping initial setup simple
Data Source
AI summary
Disclosed is a method for controlling the voltage of an electrical apparatus of a motor vehicle. The method includes the steps of measuring (E2) the voltage at the terminals of the apparatus and measuring (E3) the strength of the output current of the apparatus, calculating (E4) the values of resistance, inductance and capacitance of the equivalent circuit on the basis of the measured current strength and the measured voltage, comparing (E7, E8, E9) the calculated values of resistance, inductance and capacitance with the values of resistance, inductance and capacitance, respectively, stored in a storage area of the electronic control unit, and initiating (E12) an action if the difference between at least one of the calculated values and the corresponding stored value is above a predetermined threshold.