Actuator Controller Abnormality Detection via Dual-Direction Lock State Comparison
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Solution Overview
Problem
Existing actuator controllers struggle to accurately detect abnormalities in motor rotation and pulse signal changes, particularly when external forces constrain motor rotation, leading to potential erroneous detection in steering devices.
Innovation Solution
A controller for actuators that includes a motor control unit, pulse detecting unit, lock detecting unit, and abnormality detecting unit, which determines abnormalities by comparing lock states and operating positions between different rotation directions, preventing erroneous detection by storing and updating lock information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the abnormality detection is based on pulse signal change detection during motor operation, then the detection structure is simple, but erroneous detection occurs when external forces constrain motor rotation
Solution Approach 1:
The system performs preliminary actions by detecting lock states in both rotation directions before making an abnormality determination. The controller stores lock state information for both forward and reverse directions, and only determines an abnormality when the motor fails to rotate in either direction, preventing erroneous detection due to temporary constraints in one direction only
Solution Approach 2:
The system uses feedback by monitoring pulse signals from the pulse sensor and comparing the actual motor rotation state against expected rotation states. The controller continuously receives pulse signal feedback and uses this information to determine whether the motor is properly rotating or locked, enabling accurate abnormality detection
2Ease of operation
If the motor is constrained by external forces such as occupant weight, then the actuator cannot operate, but the system should not erroneously detect an abnormality
Solution Approach 1:
The system performs preliminary actions by detecting lock states in both rotation directions before making an abnormality determination. The controller stores lock state information for both forward and reverse directions, and only determines an abnormality when the motor fails to rotate in either direction, preventing erroneous detection due to temporary constraints in one direction only
Solution Approach 2:
The system applies dynamics by adaptively changing detection behavior based on motor operation state. When the motor is commanded to rotate but cannot move (lock state), the system recognizes this as a potential abnormality. However, by requiring lock states in both rotation directions for abnormality determination, the system dynamically adjusts to temporary constraints caused by external forces like occupant weight
Data Source
AI summary
A controller for an actuator includes a lock detecting unit configured to detect a lock state of a motor and an abnormality detecting unit configured to detect an abnormality of the actuator. The abnormality detecting unit determines that an abnormality of the actuator is detected when it is determined that an operating position of the actuator does not change between a first lock position at which the lock state of the motor in a first rotation direction is detected and a second lock position at which the lock state of the motor in a second rotation direction is detected.