Double-Winding Motor Output Control for Steering Failure
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Solution Overview
Problem
Electric power steering systems with double-winding motors face instability and performance degradation due to winding failures, which can lead to short circuits and damage to motor circuits or electronic control units, affecting steering control consistency.
Innovation Solution
A motor output control apparatus and method that includes detectors for monitoring output signals from both windings, a failure determiner to assess winding health, and an output controller to adjust the operational output of the normal winding based on input-steering torque and threshold values, ensuring continued motor performance even if one winding fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double-winding motor is used in electric power steering, then the motor can provide sufficient power and reliability, but when one winding fails, the other winding may be overloaded causing short circuits and damage to motor circuits or electronic control units
Solution Approach 1:
The control apparatus continuously monitors the output signals from both windings and compares them against expected values. When a failure in one winding is detected through this feedback mechanism, the system automatically adjusts the control signals to prevent overloading of the remaining winding, thereby avoiding short circuits and damage to motor circuits or electronic control units.
Solution Approach 2:
The control apparatus dynamically adjusts the control signals based on the real-time status of the windings. When a winding failure occurs, the system transitions from a static control mode to a dynamic control mode where the control signals are continuously modified to optimize the operation of the remaining functional winding while preventing harmful overloads.
2Ease of operation
If both windings operate normally, then the motor provides optimal steering control, but when one winding fails, heterogeneity in steering control occurs affecting driving stability
Solution Approach 1:
The control apparatus changes the operating parameters of the motor when a winding failure is detected. By adjusting the control signals to account for the failed winding, the system maintains consistent steering control characteristics and prevents heterogeneity that would otherwise affect driving stability.
3Productivity
If the motor continues to operate with one failed winding, then productivity is maintained, but the normal winding may be overloaded causing further damage
Solution Approach 1:
The control apparatus takes preliminary action by detecting winding failures and adjusting control signals before the remaining functional winding can be overloaded. This preventive measure protects the durability of the remaining winding while maintaining motor productivity, avoiding further damage that would occur if the motor continued operating with unchanged control signals.
Data Source
AI summary
A motor output control apparatus includes: an output detector configured to comprise a first detector for detecting a first output signal generated from a first winding of a motor and a second detector for detecting a second output signal generated from a second winding of the motor; a failure determiner configured to determine whether the first winding or the second winding has a failure based on at least one of the first output signal and the second output signal and based on an input-steering torque; and an output controller configured to determine whether or not an output-calculation value corresponding to the input-steering torque is less than a threshold value if it is determined that the first winding or the second winding has a failure, and configured to control an output of the normal one of the first winding or the second winding according to the determination result.