Shift Range Control Device With Homogeneous Calculation Signals
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Solution Overview
Problem
In shift range switching systems, faults in sensors or controllers can lead to motor drive failure and control inconsistency, disrupting the continuity of shift range switching and affecting controllability and efficiency.
Innovation Solution
A shift range control device with multiple controllers and detectors, where each controller acquires detection signals to determine a calculation signal of the same value, controlling current supply to corresponding winding sets based on a target shift range, ensuring continued motor drive control and avoiding control inconsistency even with partial faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple controllers are used to control motor drive, then reliability is improved through redundancy, but control inconsistency occurs due to sensor errors or faults
Solution Approach 1:
The patent implements feedback by having each controller acquire detection signals from detectors and determine calculation signals based on these signals. The controllers continuously monitor the motor's physical quantities and adjust their control outputs accordingly, ensuring that all controllers converge to the same calculation signal value even when faults occur, thus maintaining control consistency while preserving redundancy.
Solution Approach 2:
The patent introduces calculation signals as an intermediary mechanism between the detection signals and the motor drive control. Each controller independently determines calculation signals based on detection signals, and through coordinated control, ensures these calculation signals have the same value across all controllers. This intermediary layer resolves conflicts between redundant control paths and maintains uniform control output.
2Device complexity
If a single controller is used, then device complexity is reduced, but control is lost when sensor or controller faults occur
Solution Approach 1:
The patent segments the control system into multiple independent controllers, each responsible for acquiring detection signals and determining calculation signals. This segmentation allows the system to maintain control functionality even when one controller or sensor fails, as other controllers can continue operation. The segmentation is designed so that all controllers work cooperatively to maintain the same calculation signal value, balancing complexity with reliability.
3Reliability
If multiple detectors are deployed for each controller, then measurement redundancy is improved, but control inconsistency arises from sensor errors
Solution Approach 1:
The patent changes the parameter of calculation signal values across different controllers from potentially different values to the same value through coordinated control. Each controller determines calculation signals based on detection signals from detectors, and the system ensures these calculation signals converge to identical values. This parameter change resolves measurement inconsistencies while preserving the redundancy benefits of multiple detectors.
Data Source
AI summary
A shift range control device is provided for a shift range switching system that includes a motor and a plurality of detectors. The motor has a plurality of winding sets. Each of the detectors is configured to detect a physical quantity that changes in accordance with rotation of the motor. The shift range control device includes a plurality of controllers configured to control switching of a shift range by controlling drive of the motor. Each of the controllers is provided to corresponding one of the winding sets and configured to acquire detection signals from the detectors, determine, based on the detection signals, a calculation signal having a same value between the controllers, and control, based on a target shift range and the calculation signal, a current supply to the corresponding one of the winding sets.