Power Steering Signal-Line Overvoltage Blocking Circuit

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Solution Overview

Problem

In motor-driven power steering systems, a shorted signal line connecting an external sensor and an electronic control unit can generate an overvoltage, damaging electronic components.

Innovation Solution

Incorporation of first and second overvoltage preventers, each comprising a field effect transistor, to block high voltages from flowing to the electronic control unit and external sensor when the signal line is shorted, using resistors to maintain signal integrity and prevent damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a signal line connects the external sensor and electronic control unit, then signal transmission is enabled, but overvoltage can flow and damage electronic components when the signal line is shorted

Engineering Contradiction:

Improvecomponent integrityVSAvoidovervoltage damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces overvoltage preventers as intermediary components between the external sensor and electronic control unit. These preventers include field effect transistors that act as protective barriers, blocking overvoltage from reaching sensitive electronic components while allowing normal signal transmission to pass through uninterrupted.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The overvoltage preventers are configured to detect and counteract overvoltage conditions before they can cause damage to electronic components. The field effect transistors are positioned to preemptively block harmful voltage spikes, preventing the harmful effect from manifesting in the first place.

Inventive Principle:

Principle #9Preliminary anti-action

2Reliability

If overvoltage preventers are added to block high voltage, then component protection is improved, but device complexity increases

Engineering Contradiction:

Improvecomponent protectionVSAvoidcircuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The overvoltage preventers are designed to perform multiple functions: they block overvoltage during fault conditions while simultaneously allowing normal signal transmission during operational conditions. This multi-functionality reduces the need for separate protective circuits and signal paths, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Prevents damage to electronic components by blocking overvoltages, ensuring steering stability and component integrity in motor-driven power steering systems.

Implementation Method 1

a first overvoltage preventer configured to block a high voltage from flowing to the electronic control unit when the signal line (SL) is shorted to generate an overvoltage

Methodology Applied

Scientific EffectField effect transistor blocking: Electrical Resistance

Data Source

PatentUS20260035031A1Motor-driven power steering device, method for controlling the same, and vehicle having the same

Publication Date: 2026.02.05 HL MANDO CORP

AI summary

The present embodiments relate to a motor-driven power steering device and a vehicle having the same. More specifically, there may be provided a motor-driven power steering device having an overvoltage preventer blocking an overvoltage, which is generated as the signal line connecting the external sensor and the electronic control unit is shorted, from flowing to the external sensor or the electronic control unit to thereby prevent damage to electronic components due to a high voltage, a method for controlling the same, and a vehicle having the same.