Reducer Fault Detection in Motor Driven Power Steering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In motor driven power steering systems, reducer faults between the steering wheel and motor can go undetected, leading to inaccurate steering control and safety threats due to continuous motor rotation without generated steering assistance.
Innovation Solution
A system and method that includes a steering angle sensor initialization unit, a motor position sensor initialization unit, and a reducer fault detection unit to extract angles and detect faults by comparing differences, informing the driver or vehicle system of any discrepancies exceeding a predetermined angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor continuously rotates according to generated torque even when the reducer is faulty, then the motor maintains its operating function, but the steering control accuracy deteriorates and safety is threatened
Solution Approach 1:
The system performs preliminary detection by comparing the steering wheel angle from the steering angle sensor with the motor position from the motor position sensor before actual steering operation. This preliminary angle difference detection identifies potential reducer faults in advance, preventing unsafe operation and maintaining steering control accuracy.
Solution Approach 2:
The system continuously monitors the angle difference between the steering wheel and motor through feedback from both sensors. When the angle difference exceeds a predetermined threshold, the system generates a fault signal, creating a closed-loop feedback mechanism that maintains steering control accuracy by detecting and alerting to reducer faults.
2Reliability
If no fault detection system is implemented, then the device complexity is reduced, but the reliability of steering control deteriorates
Solution Approach 1:
The fault detection system utilizes the existing steering angle sensor and motor position sensor, which are already part of the motor driven power steering system. By making these existing sensors serve the additional function of fault detection through angle comparison, the system achieves reliable fault detection without adding separate dedicated detection hardware, thus minimizing device complexity.
Solution Approach 2:
The system uses its own existing sensors (steering angle sensor and motor position sensor) to detect faults internally. The control unit itself performs the comparison and fault detection without requiring external detection equipment, enabling the system to self-diagnose reducer faults and maintain reliability with minimal additional complexity.
Data Source
AI summary
Disclosed is a method and a system for detecting a reducer fault, which extracts an angle of a steering angle sensor and an angle of a motor position sensor after the initialization of the steering angle sensor and the motor position sensor, and when a difference value between two extracted angles is equal to or larger than a predetermined angle, detects a fault of a reducer for rotation connection between a steering wheel and a motor. The method and the system can accurately detect the fault of the reducer for rotation connection between the steering wheel and the motor included in the motor driven power steering system, thereby effectively preventing occurrence of an accident due to the fault of the reducer.