Motor-Driven Power Steering Torque Compensation
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Solution Overview
Problem
Conventional motor-driven power steering systems cause vehicles to pull to one side during acceleration due to structural asymmetry, leading to reduced stability and increased driver injury risk from mechanical connections.
Innovation Solution
A Motor-Driven Power Steering (MDPS) system with an information detection unit and controller that detects vehicle behavior, determines acceleration and steering intent, and generates compensation torque to counteract steering pull, using sensors for vehicle speed, torque, steering angle, accelerator pedal displacement, and yaw rate to output corrective current to the driving motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hydraulic steering system is used to reduce steering force, then steering ease is improved, but device complexity and injury risk increase
Solution Approach 1:
The patent replaces the hydraulic mechanical system with an electric motor-driven system. The MDPS uses an electric motor (200) and control unit (300) to provide steering assistance, eliminating hydraulic pumps, fluid lines, and associated mechanical components. This substitution reduces device complexity while maintaining steering ease through electronic control.
Solution Approach 2:
The patent extracts and removes the hydraulic actuator and associated hydraulic equipment from the steering system. By eliminating the hydraulic system entirely and using only electric components, the patent reduces device complexity and removes the source of mechanical injuries while preserving steering assistance functionality.
2Stability of the object's composition
If torque steer compensation is applied during acceleration, then vehicle stability is improved, but control complexity increases
Solution Approach 1:
The control unit (300) implements feedback control by continuously monitoring steering torque from the torque sensor (120) and vehicle acceleration status, then adjusting the motor torque output accordingly. The control unit calculates compensation torque based on detected steering torque and applies it dynamically, creating a closed-loop feedback system that stabilizes the vehicle during acceleration without requiring complex mechanical modifications.
Solution Approach 2:
The control unit detects steering torque and acceleration conditions in advance and pre-calculates the required compensation torque before the steering pull fully manifests. By applying compensation torque proactively based on detected conditions, the system prevents vehicle instability rather than reacting after the problem occurs.
Data Source
AI summary
Disclosed herein are Motor-Driven Power Steering (MDPS) and a control method thereof. The MDPS includes an information detection unit configured to detect information about the behavior of a vehicle; and a controller configured to receive the information about the behavior of the vehicle from the information detection unit, to determine whether the vehicle is accelerating and whether the vehicle pulls to one side, and to generate compensation torque and drive a driving motor based thereon.