SR Motor Phase Lead Control via Speed Error Feedback
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Solution Overview
Problem
Conventional shift range control apparatuses face complexity in matching phase lead correction values due to the need for best-matched map data corresponding to the shape of the detent plate, making it difficult to simplify the matching operation.
Innovation Solution
A shift range control apparatus that includes a target rotation speed setting part, rotation speed detection part, rotation speed error calculation part, request torque calculation part, and phase lead correction value calculation part, which calculates the phase lead correction value based on the request torque, simplifying the matching process by feedback-controlling the rotation speed based on voltage and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If map data is set in correspondence to the shape of the detent plate to attain best matching, then the control precision of the SR motor is improved, but the device complexity and matching operation difficulty increase
Solution Approach 1:
The invention introduces feedback control by calculating the actual rotation speed of the SR motor and comparing it with the target rotation speed. The phase lead correction value is determined based on the rotation speed error, creating a closed-loop control system that automatically adjusts the current supply phase to achieve precise control without complex manual matching operations.
Solution Approach 2:
The invention changes the control parameter from fixed map data based on detent plate shape to dynamic phase lead correction values calculated from rotation speed error. This parameter change allows the system to adapt to different operating conditions and eliminates the need for complex pre-matching operations while maintaining control precision.
2Measurement precision
If map data is set in correspondence to the shape of the detent plate to attain best matching, then the control precision of the SR motor is improved, but the ease of operation deteriorates
Solution Approach 1:
The system performs self-adjustment by automatically calculating the phase lead correction value based on the detected rotation speed error. The control apparatus self-corrects the current supply phase timing without requiring external intervention or complex matching operations, making the system easier to operate while maintaining high control precision.
Solution Approach 2:
The feedback mechanism enables the system to automatically adjust itself based on actual performance. By continuously monitoring rotation speed and adjusting the phase lead correction value accordingly, the system eliminates the need for manual matching operations while achieving precise control.
3Ease of operation
If phase lead correction value is calculated based on rotation speed error and request torque, then the ease of operation is improved, but the control precision may deteriorate
Solution Approach 1:
The invention uses parameter changes (phase lead correction value) that are dynamically calculated from easily measurable quantities (rotation speed error and request torque). This approach maintains control precision while simplifying operation because the correction values are automatically computed from real-time sensor data rather than requiring complex pre-matching procedures.
Solution Approach 2:
The feedback-based calculation of phase lead correction value from rotation speed error ensures control precision is maintained. The system continuously adjusts the current supply phase based on actual performance, automatically compensating for variations and maintaining high precision without complex manual intervention.
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
This solution simplifies the matching process for phase lead correction values, improving durability and reliability of the switched reluctance motor by eliminating the need for complex matching operations and allowing for easier adaptation to changes in motor characteristics.
Implementation Method 1
a motor (SR motor)
Data Source
AI summary
A control circuit controls driving of a motor to switch over a shift range. A target rotation speed setting part sets a target rotation speed of the motor. A rotation speed detection part detects a present rotation speed, which is an actual rotation speed, of the motor. A rotation speed error calculation part calculates a rotation speed error, which is an error between the target rotation speed and the present rotation speed. A request torque calculation part calculates a request torque for the motor based on the rotation speed error. A phase lead correction value calculation part calculates a phase lead correction value of a current supply phase relative to a rotation phase of a rotor of the motor based on the request torque.