Steering Control Device Standard Value Adjustment
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Solution Overview
Problem
Existing steering control devices face a decrease in feedback control effectiveness due to deviations in the standard value associated with the straight-ahead state of turning wheels, which can occur during assembly and affect the accuracy of angle feedback control.
Innovation Solution
A steering control device with a control unit that executes a standard value adjustment process, adjusting the stored standard value when a diagnostic state is present, to minimize deviations in the control angle from the straight-ahead state, thereby enhancing feedback control effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the standard value is set during assembly work, then the turning unit can be assembled and operated, but the standard value may deviate from the neutral position causing decreased feedback control effectiveness
Solution Approach 1:
The system performs preliminary detection of the control angle during assembly or maintenance work, stores the detected angle as a new standard value, and thereby corrects any deviation before normal operation begins. This preliminary correction action eliminates the need for manual recalibration while ensuring accurate feedback control from the start of operation.
2Ease of operation
If feedback control is performed using the standard value, then the turning wheel can be controlled to a target turning state, but deviations in the standard value reduce the effectiveness of feedback control
Solution Approach 1:
The system continuously monitors the control angle during diagnostic states (assembly or maintenance work), detects deviations from the expected neutral position, and automatically updates the standard value based on the detected actual angle. This feedback mechanism ensures that the standard value always reflects the true mechanical neutral position, thereby maintaining high feedback control effectiveness.
3Adaptability or versatility
If the standard value deviates from the neutral position, then the turning unit operates with the set standard value, but the control angle deviates from the value showing the straight-ahead state
Solution Approach 1:
The system dynamically changes the standard value parameter from a fixed factory-set value to an adaptive value that is automatically updated based on detected control angles during diagnostic states. This parameter change allows the system to adapt to actual mechanical conditions and eliminates the accumulation of angular deviations, thereby restoring measurement precision without affecting operational versatility.
Data Source
AI summary
A steering control device includes a control unit. The control unit is configured to execute a control angle calculation process, an angle feedback process, and a standard value adjustment process. The control angle calculation process is a process of calculating a control angle as an absolute angle relative to a standard value, and the angle feedback process is a process of performing feedback control on the control angle, and the standard value adjustment process is a process of adjusting the stored standard value. The standard value adjustment process includes a process of, when, in a straight-ahead state, the control angle deviates from a value showing the straight-ahead state, adjusting the standard value such that the deviation of the control angle from the value showing the straight-ahead state decreases.