Electric Power Steering Motor Control via Segmented Feedback
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Solution Overview
Problem
Existing electric power steering apparatuses face a calculation load increase when performing synchronization control of two-system motors, leading to potential tracking delays and reduced steering responsiveness.
Innovation Solution
The electric power steering apparatus includes steering torque and vehicle speed detection, current detection in motor driving systems, and a d/q coordinate system current feedback calculation to reduce the calculation load of the control device, allowing for synchronized control of two-system motors and providing a favorable steering assist force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronization control is performed by monitoring both control devices, then the two-system motor can be controlled synchronously, but the calculation load of the control device increases
Solution Approach 1:
The control system is divided into two independent control devices, each responsible for controlling one motor. Each control device independently calculates its own motor's control signals without needing to monitor the other control device, thereby reducing the calculation load while maintaining synchronization through shared current feedback.
Solution Approach 2:
The current feedback signals from both motor driving systems are combined and fed back to both control devices. This allows each control device to independently generate control signals based on the combined current feedback, achieving synchronous control without increasing calculation load through merging the control calculation functions.
2Extent of automation
If the calculation load increases, then more comprehensive control can be performed, but tracking delay occurs and steering responsiveness reduces
Solution Approach 1:
By segmenting the control calculation into two independent control devices, each device processes only its own motor's control signals, significantly reducing the calculation load per device. This enables faster real-time control responses while maintaining comprehensive control through the distributed architecture.
Solution Approach 2:
The system implements real-time current feedback from both motor driving systems that is processed independently by each control device. This feedback mechanism enables rapid adjustment of motor currents to match command values, improving tracking speed and steering responsiveness without sacrificing control comprehensiveness.
Data Source
AI summary
Motor control command output means outputs, as a motor control command, a second command value, which is calculated by second command value calculating means on the basis of a first command value generated by first command value calculating means and a current value obtained by causing motor driving system current adding means to add together currents of respective motor driving systems, to the motor driving systems of two systems constituted by a motor and drive circuits for driving the motor. The second command value calculating means may calculate the second command value by performing a d/q coordinate system current feedback calculation using the current value.