Dynamic Holding Time for Pneumatic Ride Level Control
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Solution Overview
Problem
Existing pneumatic ride level control systems for motor vehicles use a fixed holding time when deactivating or activating functions based on dynamic-movement variables, which can lead to suboptimal driving properties due to either excessively long or short holding times.
Innovation Solution
A control unit that dynamically adjusts the holding time duration based on the magnitude of exceeding or undershooting of limiting values for each dynamic-movement variable, allowing for differentiated reactions and improved motor vehicle behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed holding time is used in the control unit, then the control logic is simple, but the driving properties become suboptimal due to either excessively long or short holding times
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a static fixed holding time to a dynamic holding time that varies based on the magnitude of exceeding or undershooting the limiting value. The control unit now calculates holding time as a function of the deviation magnitude, allowing the system to adapt its response duration to the severity of the condition, thereby optimizing driving properties without excessive complexity
Solution Approach 2:
The patent implements parameter changes by making the holding time parameter variable rather than constant. The control unit adjusts the holding time parameter based on the magnitude of the dynamic-movement variable deviation from the limiting value, enabling optimized control response for different severity levels while maintaining manageable control logic
2Stability of the object's composition
If the holding time is extended to ensure stable control, then control stability improves, but the system responds too slowly to changing conditions
Solution Approach 1:
The system dynamically adjusts holding time based on the magnitude of deviation from the limiting value. For small deviations, a shorter holding time enables faster response to changing conditions. For large deviations, a longer holding time maintains control stability. This dynamic adaptation resolves the contradiction between stability and response speed
Solution Approach 2:
The holding time parameter is changed from a fixed value to a variable that depends on the deviation magnitude. This parameter change allows the system to automatically select appropriate holding times: shorter for minor deviations (faster response) and longer for major deviations (better stability), thus resolving the speed-stability trade-off
3Speed
If the holding time is shortened to respond quickly to conditions, then system responsiveness improves, but control stability deteriorates
Solution Approach 1:
The dynamic holding time calculation ensures that when the deviation magnitude is large, the holding time is extended to maintain control stability. When the deviation is small, the holding time is reduced for faster response. This dynamic adjustment prevents premature switching while maintaining responsiveness
Solution Approach 2:
By changing the holding time parameter based on deviation magnitude, the system ensures sufficient holding time for large deviations (maintaining stability) while allowing shorter holding times for small deviations (improving responsiveness). This parameter adaptation resolves the stability-speed contradiction
Data Source
AI summary
A control unit of a pneumatic ride level control system of a motor vehicle, the control unit deactivating at least one function of the pneumatic ride level control system and/or activating at least one function of the pneumatic ride level control system if a limiting value of at least one dynamic-movement variable is exceeded or undershot, keeping the or each deactivated function deactivated for a defined holding time and/or keeping the or each activated function activated for a defined holding time duration after a subsequent undershooting or exceeding of the limiting value, and subsequently ending the deactivation of the or each deactivated function and/or the activation of the or each activated function after the respective holding time duration has elapsed, and the control unit defining the respective holding time duration as a function of the magnitude of the exceeding or undershooting of the respective limiting value.