Steering Control Apparatus Load Distribution
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Solution Overview
Problem
Existing steering control systems face issues where components in multiple systems fail simultaneously due to identical control loads, leading to potential system failures and reduced reliability.
Innovation Solution
A steering control apparatus that differentiates the control loads between multiple systems by adjusting the command values for motor coils based on steering torque, employing unbalanced control when torque is below a threshold and parallel control when torque exceeds the threshold, thereby distributing power supply differently between systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If control loads are imposed in the same way on components in respective systems, then control simplicity is maintained, but components may fail at the same timing due to identical stress patterns
Solution Approach 1:
The patent implements parameter changes by varying motor control signals (such as duty cycles, frequencies, or phase timings) supplied to coils in respective systems. This causes control loads on components like microcomputers, drive circuits, and coils to differ between systems. The parameter variations are implemented through control circuits that generate different signals while maintaining overall control functionality, thus preventing identical stress patterns without significantly increasing control complexity.
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
This approach prevents simultaneous failures in components by distributing control loads unevenly when torque is low and evenly when torque is high, enhancing system reliability and extending component lifespan.
Implementation Method 1
a steering system configured to apply, by a motor (20), a driving force for reciprocating a steering operation shaft (11a)
Data Source
AI summary
Provided is a steering control apparatus configured to suppress the occurrence of abnormalities in components in respective systems at the same timing. A first assist torque calculation circuit calculates a first command value and a second command value based on a steering torque. A first current feedback control circuit calculates a control signal by using the first command value. A second current feedback control circuit calculates a control signal by using the second command value. When the steering torque is equal to or smaller than a steering torque threshold, the first assist torque calculation circuit executes calculation so that the first command value is larger than the second command value. After the steering torque exceeds the steering torque threshold, the first assist torque calculation circuit executes calculation so that the first command value is equal to the second command value.