Suspension System Sequential Height Control by Resistance
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Solution Overview
Problem
Existing suspension systems face challenges in efficiently controlling vehicle height across all wheels due to varying resistance levels in each suspension, leading to accompaniment effects that result in vehicle height changes and control hunting, making it difficult to promptly achieve target vehicle height.
Innovation Solution
A suspension system that prioritizes vehicle height control for the wheel with the larger resistance magnitude before controlling the wheel with smaller resistance, utilizing a sequential control approach and resistance magnitude analysis to minimize accompaniment and optimize vehicle height adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If vehicle height control is executed simultaneously for all wheels, then control simplicity is maintained, but accompaniment effects occur causing vehicle height changes and control hunting
Solution Approach 1:
The patent segments the vehicle height control process into sequential stages based on suspension resistance magnitudes. Instead of simultaneous control, the system divides wheels into groups (first plurality with larger resistance, second plurality with smaller resistance) and executes control in sequence, thereby eliminating accompaniment effects while maintaining systematic control approach
Solution Approach 2:
The patent applies preliminary action by first determining the magnitude of resistance for each suspension before executing vehicle height control. This preliminary assessment allows the system to plan and execute control in the optimal sequence, preventing accompaniment effects from occurring during the control process
2Speed
If vehicle height control is executed for wheels with smaller resistance first, then control speed is improved, but accompaniment effects cause vehicle height changes in already-controlled wheels
Solution Approach 1:
The patent inverts the conventional approach by controlling wheels with larger resistance first instead of smaller resistance. This reversal prevents accompaniment effects from affecting already-controlled wheels, as the high-resistance suspensions are less susceptible to being influenced by subsequent control actions on low-resistance suspensions
3Device complexity
If vehicle height control is executed without considering resistance magnitude, then control process is simplified, but control time is extended due to repeated adjustments
Solution Approach 1:
The system performs preliminary determination of resistance magnitudes for all suspensions before executing vehicle height control. This upfront assessment enables optimal sequencing of control actions, ensuring that wheels are controlled in an order that minimizes accompaniment effects and reduces the need for repeated adjustments, thereby reducing total control time
Data Source
AI summary
A suspension system includes: suspensions that respectively include vehicle height control actuators; a pressure medium supply-discharge device; and a vehicle height controller configured to control the pressure medium supply-discharge device to control vehicle height, wherein a magnitude of resistance that is generated during a change in the vehicle height at one or more of the suspensions is larger than a magnitude of resistance at another one or more of the suspensions, and the vehicle height controller is configured to execute vehicle height control for the wheel that corresponds to the one or more of the suspensions with the large magnitude of the resistance prior to vehicle height control for the wheel that corresponds to the other one or more of the suspensions with the small magnitude of the resistance.