Suspension Control Apparatus Stroke Velocity Calculation
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Solution Overview
Problem
Existing suspension systems face a trade-off between responsiveness and accuracy when calculating stroke velocity, leading to suboptimal damping force control, as increased responsiveness degrades accuracy and vice versa.
Innovation Solution
A control apparatus that calculates stroke velocity using both a first and a second time constant, with a mixture ratio derivation and restriction mechanism to achieve a weighted average, ensuring compatibility between responsiveness and accuracy for improved damping force control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a smaller time constant is used to differentiate stroke amount, then responsiveness is improved, but accuracy of stroke velocity calculation is degraded
Solution Approach 1:
The patent divides the single differentiation process into two separate differentiation processes with different time constants. The first calculation section uses a first time constant to calculate first stroke velocity, while the second calculation section uses a second time constant to calculate second stroke velocity. This segmentation allows each section to optimize for different characteristics (responsiveness vs. accuracy) and then combines them to achieve both.
Solution Approach 2:
The patent changes the time constant parameter between the two calculation sections. The first calculation section uses a first time constant (smaller value) for better responsiveness, while the second calculation section uses a second time constant (larger value) for better accuracy. By varying this critical parameter, the system achieves both responsiveness and accuracy in the final stroke velocity calculation.
2Measurement precision
If a larger time constant is used to differentiate stroke amount, then accuracy of stroke velocity is improved, but responsiveness is degraded
Solution Approach 1:
The patent segments the differentiation task into two parallel processes, where the second calculation section specifically handles the accuracy requirement by using a larger second time constant. This dedicated section ensures accurate stroke velocity calculation while the first section handles responsiveness, and their results are combined.
Solution Approach 2:
The patent applies parameter changes by using a larger second time constant in the second calculation section compared to the first time constant in the first calculation section. This parameter variation allows the second section to prioritize accuracy over responsiveness, and the combination of both sections achieves the desired balance.
3Device complexity
If single time constant differentiation is used, then device complexity is reduced, but compatibility between responsiveness and accuracy cannot be achieved
Solution Approach 1:
The patent segments the calculation into two parallel differentiation paths with different time constants, then combines their results. This segmentation enables the system to achieve both responsiveness and accuracy simultaneously, overcoming the limitation of single-time-constant methods while maintaining reasonable structural complexity through systematic combination of the two paths.
Data Source
AI summary
A control apparatus for a suspension apparatus includes: an acquisition section which acquires a stroke amount of the suspension apparatus disposed between a vehicle body and a wheel to damp vibration propagated from the wheel; a calculation section which calculates a stroke velocity based on the stroke amount; and a damping force control section which controls damping force of the suspension apparatus based on the stroke velocity. The calculation section includes a first calculation section which differentiates the stroke amount by use of a first time constant as a time constant, to thereby calculate a first stroke velocity, and a second calculation section which differentiates the stroke amount by use of a second time constant larger than the first time constant as a time constant, to thereby calculate a second stroke velocity, and calculates the stroke velocity based on the first stroke velocity and the second stroke velocity.