DC Motor Control Device Abnormality Detection
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Solution Overview
Problem
Existing DC electric motor control devices fail to prevent abnormal operation states, particularly in scenarios where the motor is not reversely rotated, which can lead to safety issues such as uncontrolled opening or closing of vehicle components like rear hatches and slide doors, especially when breakdowns occur.
Innovation Solution
A DC electric motor control device that includes a motor driving circuit, a controller, and an abnormality determination part, which performs reverse rotation control for a predetermined time before normal operation to ensure the motor is functioning correctly, preventing drive in abnormal states by determining if an abnormality is present based on current and position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reverse rotation control is performed for a predetermined time before normal operation, then reliability of motor operation is improved, but loss of time increases due to the additional verification step
Solution Approach 1:
The control device performs reverse rotation control for a predetermined time period before executing normal rotation control. This preliminary action verifies that the motor can rotate in both directions, ensuring that the motor is functioning correctly and preventing abnormal operation during subsequent normal operation.
2Reliability
If abnormality determination is performed during reverse rotation control, then reliability of preventing abnormal drive is improved, but device complexity increases due to additional control logic
Solution Approach 1:
The control device includes an abnormality determination part that monitors motor behavior during reverse rotation control. Based on feedback from this monitoring, the system determines whether to proceed with normal rotation control or prevent abnormal drive, ensuring safe operation through continuous verification.
Data Source
AI summary
A DC electric motor control device has a motor driving circuit that is constructed by a plurality of switching elements, a controller that operates the motor driving circuit to control a normal rotation or a reverse rotation of a DC electric motor, and an abnormality determination part that determines whether an abnormality is generated while the controller controls the DC electric motor. The controller previously performs reverse rotation control of the DC electric motor for a predetermined time using the motor driving circuit when performing normal rotation control of the DC electric motor, and the controller performs the normal rotation control only when the abnormality determination part determines that the abnormality is not generated during the reverse rotation control.