Shift Range Control Motor Feedback and Stationary Phase Energization
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Solution Overview
Problem
Conventional shift range switching mechanisms using switched reluctance motors face responsiveness issues due to cogging torque, especially when feedback gain is increased to improve responsiveness, leading to hunting problems during motor stoppage.
Innovation Solution
A shift range control apparatus that employs a permanent magnet DC brushless motor with a feedback controller, stationary phase energization controller, and switching controller to perform position feedback control and switch to stationary phase energization control when the actual angle approaches the target angle, improving responsiveness and stability during shift range switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If feedback gain is increased to improve responsiveness, then responsiveness is improved, but hunting occurs during motor stoppage
Solution Approach 1:
The patent dynamically switches between two control modes (position feedback control and stationary phase energization control) based on the motor's operational state. This dynamic adaptation allows the system to achieve high responsiveness during motion while ensuring stable stopping, resolving the contradiction between speed and stability.
Solution Approach 2:
The patent changes the control parameter by switching control modes based on the difference between target angle and actual angle. When the difference is large, position feedback control is used for responsiveness; when the difference is small, stationary phase energization control is used for stable stopping, thus resolving the hunting issue while maintaining responsiveness.
2Speed
If position feedback control is used to improve responsiveness, then responsiveness is improved, but hunting occurs when motor stops
Solution Approach 1:
The patent extracts the harmful effect of hunting by introducing a separate control mode (stationary phase energization control) that specifically addresses the stopping phase. This separates the control strategies for motion and stopping, eliminating hunting while preserving responsiveness during movement.
Solution Approach 2:
The switching controller acts as an intermediary that selects between position feedback control and stationary phase energization control based on the angle difference. This intermediary mechanism ensures the appropriate control mode is applied at the right time, preventing hunting while maintaining responsiveness.
3Device complexity
If switched reluctance motor is used for simple structure, then structure is simplified, but responsiveness is slower compared to permanent magnet motor
Solution Approach 1:
The patent changes the control parameters dynamically by switching between position feedback control (for responsiveness) and stationary phase energization control (for stable stopping). This parameter adaptation enables the permanent magnet motor to achieve both fast responsiveness and stable stopping without structural complexity.
4Productivity
If feedback gain is increased to improve responsiveness, then responsiveness is improved, but hunting occurs
Solution Approach 1:
The patent employs dynamic switching between control modes based on real-time angle difference feedback. This dynamic approach allows high feedback gain for responsiveness during motion while switching to stationary phase energization control for stable stopping, thus resolving the contradiction between productivity and reliability.
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
The solution enhances motor responsiveness during shift range switching and ensures stable stopping of the motor by switching from position feedback control to stationary phase energization control, reducing hunting and improving overall control efficiency.
Implementation Method 1
A shift range control apparatus is disclosed which employs a permanent magnet DC brushless motor
Implementation Method 2
The feedback controller performs position feedback control based on a target angle determined corresponding to a request shift range and on an actual angle of the motor
Implementation Method 3
The stationary phase energization controller performs stationary phase energization control energizing a stationary phase selected corresponding to the actual angle
Data Source
AI summary
A shift range control apparatus switches shift range by controlling the drive of a motor. The shift range control apparatus includes a feedback controller that is configured to perform position feedback control based on a target angle determined corresponding to the request shift range and the actual angle of the motor; a stationary phase energization controller that is configured to perform stationary phase energization control that energizes a stationary phase selected corresponding to an actual angle; and a switching controller that switches between motor control states. The switching controller switches the control state to position feedback control when the request shift range is switched. When the difference between the target angle and the actual angle becomes equal to or less than an angle determination threshold value, the switching controller switches the control state from position feedback control to the stationary phase energization control.