Steering Control Device Power Supply Switching
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Solution Overview
Problem
Steering devices with backup power supplies face limitations in maintaining continuous operation during power supply abnormalities, leading to potential torque output limitations due to the restricted capacity of the backup power supply.
Innovation Solution
A steering control device that includes a controller capable of detecting abnormalities in the primary power supply and initiating an output limiting process before switching to a secondary power supply, ensuring torque output does not exceed the secondary power supply's capacity, thereby reducing the risk of torque limitation during power supply failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the output limiting process is started after switching to the second power supply is completed, then the switching operation is simple, but the torque output may exceed the second power supply's capacity causing operation failure
Solution Approach 1:
The controller starts the output limiting process before the power supply switching is completed. Specifically, when an abnormality of the first power supply is detected, the controller executes the output limiting process that limits torque outputtable by the motor, and this process is started after the abnormality is detected and before switching of the connection state to the second state is completed. This preliminary action ensures that torque output is controlled within the second power supply's capacity from the beginning of the transition, preventing operation failure.
2Reliability
If the second power supply has lower performance than the first power supply, then the backup power supply can provide adequate backup capacity, but the motor torque output must be limited to match the reduced capacity
Solution Approach 1:
The system dynamically adjusts the motor torque output based on the active power supply's capacity. The controller executes an output limiting process that adapts torque limits to the current power supply state. When switching to the second power supply with lower performance, the controller limits torque output to match the second power supply's capacity, ensuring reliable operation within available power constraints while maximizing the use of backup power capacity.
Data Source
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AI summary
A steering control device (1) includes a controller including a drive circuit (61a) that performs action for supplying, to a motor, electric power supplied by being connected to at least one of a first and a second power supply. When a connection state of the drive circuit (61a) is a state in which electric power is supplied from the first power supply, the connection state is switched by a power supply device (80) to transition to a second state in which electric power is supplied from the second power supply when an abnormality of the first power supply is detected. Moreover, the controller starts an output limiting process of limiting torque outputtable by the motor as compared with before the abnormality of the first power supply is detected, after the abnormality is detected and before switching of the connection state is completed.