Steering Assist Device Lateral Deviation Compensation
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Solution Overview
Problem
Existing steering assist devices for vehicles fail to effectively guide vehicles back onto their intended lane, particularly in situations where lateral deviation and deviation rate are not adequately addressed, leading to potential collisions with other vehicles or road barriers.
Innovation Solution
A steering assist device comprising an electric motor, an information acquisition unit, a basic target current value setting unit, a current compensation value computation unit, and a control unit that computes and applies a target current value to correct lateral deviation and deviation rate, ensuring the vehicle aligns with the target travel line and maintains parallelism with it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vehicle departs from a lane due to driver carelessness or road surface conditions, then the vehicle may contact another vehicle or a guard rail, but existing steering assist devices fail to effectively guide vehicles back onto their intended lane
Solution Approach 1:
The patent implements a feedback control system that continuously monitors lateral deviation from the target travel line and adjusts steering motor output accordingly. The control unit receives lateral deviation information from the information acquisition unit and modifies the electric motor's steering drive force to correct lane departure, creating a closed-loop feedback mechanism that actively guides the vehicle back to the intended lane.
Solution Approach 2:
The patent replaces traditional mechanical steering assistance with an electric motor-based system. Instead of relying solely on mechanical linkages or hydraulic power steering, the invention uses an electric motor that can be precisely controlled through electronic signals, allowing for more accurate and responsive steering corrections based on real-time lateral deviation data.
2Reliability
If steering drive force is applied to correct lateral deviation, then the vehicle can be guided back to the target travel line, but the steering system becomes more complex
Solution Approach 1:
The electric motor serves multiple functions within the steering system: it provides the primary steering drive force, generates corrective steering moments to address lateral deviation, and can operate in different modes (steering assistance, lane keeping, emergency correction). This multi-functionality reduces the need for separate dedicated components for each steering function, thereby managing system complexity while improving lane keeping capability.
Solution Approach 2:
The system dynamically adjusts the current output parameter of the electric motor based on the degree and rate of lateral deviation. By varying the motor current from a basic target value to a corrected target value according to real-time lateral deviation information, the system achieves precise control without requiring overly complex mechanical structures, as the parameter adjustment handles the complexity computationally rather than mechanically.
3Reliability
If the vehicle is guided to maintain parallelism with the target travel line, then lane departure is prevented, but the control system requires real-time computation of compensation values
Solution Approach 1:
The patent introduces an intermediary computational layer that processes lateral deviation information and translates it into appropriate motor control commands. The current compensation value computation unit acts as an intermediary that takes raw lateral deviation data and computes corrected current values, bridging the gap between measurement and actuation. This intermediary computation simplifies the overall measurement and control process by handling the complexity centrally rather than requiring multiple sensors and actuators distributed throughout 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
The device effectively guides the vehicle to stay within its lane by correcting steering forces based on lateral deviation and deviation rate, preventing lane departure and ensuring the vehicle's centerline remains parallel to the target travel line.
Implementation Method 1
an electric motor that supplies applies a steering drive force to a steering mechanism of a vehicle
Data Source
AI summary
There is provided a steering assist device that allows a vehicle to avoid departing from a lane. A basic target current value setting unit sets a basic target current value on the basis of steering torque and a vehicle speed. A current compensation value computation unit computes a current compensation value for compensating the basic target current value on the basis of a lateral deviation and a lateral deviation variation rate such that the lateral deviation and the lateral deviation variation rate get close to zero. A target current value computation unit computes a target current value by subtracting the current compensation value computed by the current compensation value computation unit from the basic target current value set by the basic target current value setting unit.