Steering Filter Circuit With Short-Circuit Current Blocking
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Solution Overview
Problem
The existing electric power steering systems face issues with short circuits due to bending forces on printed circuit boards when battery cables are attached or detached, potentially damaging filter device elements near the battery connector.
Innovation Solution
A filter device and steering control device are designed with a capacitor unit and a short-circuit prevention unit connected in series, where the short-circuit prevention unit blocks short-circuit currents by changing impedance when the capacitor unit is short-circuited, preventing damage and maintaining system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a battery cable is attached or detached in the electric power steering system, then the battery connector can be connected or disconnected, but the printed circuit board is subjected to bending force which may damage filter device elements
Solution Approach 1:
The patent applies preliminary anti-action by pre-positioning the filter device at a location远离 the battery connector, specifically near the ECU, to prevent it from being affected by bending forces during battery cable attachment or detachment operations
Solution Approach 2:
The patent introduces an intermediary approach by relocating the filter device to serve as a mediator between the ECU and the battery connector, placing it in a position that is not subjected to mechanical stress from battery cable operations
2Ease of manufacture
If the filter device is located near the battery connector for ease of access, then installation is simplified, but elements may be damaged by external forces from cable attachment
Solution Approach 1:
The patent applies the taking out principle by extracting the filter device from its traditional location near the battery connector and repositioning it near the ECU, thereby removing it from the harmful zone where bending forces occur during battery cable attachment or detachment
3Reliability
If the capacitor unit is short-circuited due to external force, then noise filtering continues, but a short-circuit current may cause further damage
Solution Approach 1:
The patent applies beforehand cushioning by introducing a short-circuit prevention unit that acts as a protective measure in advance. This unit is designed to detect and block short-circuit currents before they can cause damage to other components, while allowing the capacitor unit to continue its noise filtering function even when short-circuited
Solution Approach 2:
The patent converts the harmful short-circuit condition into a beneficial situation by designing the short-circuit prevention unit to automatically detect when the capacitor unit is short-circuited and block the resulting short-circuit current, thereby transforming a potentially damaging event into a controlled condition that protects the system
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
Effectively prevents short circuits in both filter devices and steering control systems, ensuring continuous operation and reducing the risk of component damage from external forces.
Implementation Method 1
when the capacitor unit is short-circuited, the short-circuit prevention unit may block a short-circuit current by changing an impedance formed through the capacitor unit and the short-circuit prevention unit connected in series
Data Source
AI summary
The present embodiments relate to a filter device and a steering control device. The filter device filters noise by comprising a capacitor unit and a short-circuit prevention unit, wherein the capacitor unit and the short-circuit prevention unit are connected in series to each other, and when the capacitor unit is short-circuited, the short-circuit prevention unit may block a short-circuit current by changing impedance formed through the capacitor unit and the short-circuit prevention unit which are connected in series to each other.