Dynamic Airflow Isolation for RV Height Control
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Solution Overview
Problem
Existing ride height control systems for recreational vehicles with air suspension face challenges in dynamically switching between height control modes, particularly during travel, leading to issues like front-end leaning and uneven load distribution, and struggle with uneven ground conditions when parked.
Innovation Solution
A system utilizing four height control sensors and a cross-flow averager that dynamically switches between three and four sensor control modes based on vehicle speed, using a cross-flow valve to isolate or allow airflow between front airbags, effectively controlling vehicle height by averaging front airbags at low speeds and switching to independent corner control at higher speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a four-sensor control system is used at all speeds, then height control precision is improved, but system complexity and responsiveness to ground conditions worsen
Solution Approach 1:
The system dynamically switches between three-sensor and four-sensor control modes based on vehicle speed. At low speeds (below threshold), the cross-flow averager connects front airbags to allow ground adaptation with three sensors. At high speeds (above threshold), the cross-flow averager isolates front airbags enabling four-sensor independent control for precision height management during travel.
2Stability of the object's composition
If front airbags are isolated at low speeds, then height control stability is improved, but adaptability to uneven ground worsens
Solution Approach 1:
The cross-flow averager dynamically adjusts the pneumatic connection state between front airbags based on vehicle speed. Below the speed threshold, it opens the cross-flow path to allow air transfer between front airbags, enabling the vehicle to adapt to uneven ground. Above the threshold, it closes the cross-flow path to isolate front airbags for stable height control during travel.
3Ease of operation
If cross-flow averaging is used at high speeds, then low-speed maneuverability is improved, but height control precision and leaning control worsen
Solution Approach 1:
The velocity monitor and processor continuously monitor vehicle speed and dynamically control the cross-flow averager valve. When vehicle speed exceeds the predetermined threshold during travel, the system switches to four-sensor independent mode to prevent front-end leaning and improve height precision. When speed drops below the threshold, it switches to three-sensor cross-flow mode to maintain ground adaptation capability.
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 solution enhances vehicle stability during travel by switching to a four-sensor system above a pre-set speed, improving height control and reducing leaning issues, while reverting to a three-sensor system at lower speeds for better low-speed maneuverability and ground adaptation.
Implementation Method 1
The cross-flow averager and the processor cooperate with at least the height sensors corresponding to at least the front corners, so as to provide a single pseudo height controller controlling, by selective actuation of the cross-flow averager, airflow between the corresponding front corners
Data Source
AI summary
A ride height control system includes a velocity monitor, corner ride height sensors, a processor receiving height inputs from the height sensors and velocity inputs from the velocity monitor. A cross-flow averager cooperates between the front airbags and is in communication with the processor. The cross-flow averager and the processor cooperate with the height sensors corresponding to the front corners, so as to provide a single pseudo height controller controlling, by selective actuation of the cross-flow averager, airflow between the corresponding front corners. The velocity monitor monitors forward velocity of the vehicle and provides velocity information to the processor. The processor causes the cross-flow averager to isolate the front airbags when the velocity is above a non-zero pre-set velocity and to allow a cross-flow of the airflow between the front airbags below the pre-set velocity. The pre-set velocity may be a range of velocities.