Bimodal Air Suspension Stabilization for Aerial Lift Vehicles
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Solution Overview
Problem
Conventional motor vehicle suspension systems for aerial lift units, such as those using torsion bars, compromise ride comfort and drivability due to the need for heavy ballast and large diameter torsion bars, which also reduce carrying capacity and fuel economy, while failing to maintain chassis levelness within ANSI regulations, leading to unsafe operational conditions.
Innovation Solution
An electronic height control system for vehicle chassis air suspension that switches to a stabilization and leveling mode when the aerial lift unit is activated, using a bimodal suspension control system integrating an electrical system controller, electronic hydraulic control module, and data links to adjust air spring pressures based on a two-axis level sensor, ensuring the vehicle remains level and stable, even on uneven terrain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If torsion bar systems are used to stabilize the vehicle, then vehicle stability is improved, but ride comfort and drivability deteriorate due to heavy ballast and oversized torsion bars
Solution Approach 1:
The patent replaces the mechanical torsion bar stabilization system with an electronic height control system that uses air suspension and electronic sensors to maintain vehicle stability. This substitution eliminates the need for heavy ballast and oversized mechanical components, thereby improving ride comfort and drivability while maintaining stabilization capability.
Solution Approach 2:
The system dynamically adjusts suspension parameters (air pressure, spring stiffness) based on real-time sensor data from level sensors and height control sensors. This allows the suspension to adapt to different operating conditions, providing stability when needed while maintaining comfort during normal operation.
2Stability of the object's composition
If heavy ballast is added to stabilize the chassis, then vehicle stability is improved, but carrying capacity and fuel economy deteriorate
Solution Approach 1:
The electronic height control system replaces the need for heavy ballast with an active control mechanism that uses air suspension and electronic sensing. This eliminates the permanent weight penalty while maintaining chassis stability, thereby preserving carrying capacity and fuel economy.
Solution Approach 2:
The system transitions from a static stabilization approach (heavy ballast) to a dynamic control system that actively adjusts suspension characteristics in real-time. This allows the vehicle to maintain stability without the permanent weight penalty of ballast, preserving carrying capacity.
3Stability of the object's composition
If oversized torsion bars are installed to prevent vehicle tipping, then vehicle stability is improved, but installation difficulty and cost increase
Solution Approach 1:
The patent replaces the mechanical torsion bar system with an electronic control system using air suspension components and sensors. This substitution eliminates the need for installing large-diameter torsion bars, significantly reducing installation complexity and cost while maintaining stabilization effectiveness.
4Stability of the object's composition
If the suspension system is stiffened with torsion bars, then vehicle stability is improved, but the ability to level the chassis on uneven ground deteriorates
Solution Approach 1:
The system uses dynamic control to adjust suspension characteristics in real-time based on terrain conditions and aerial lift position. This allows the vehicle to maintain stability while adapting to uneven ground, enabling chassis leveling capability that rigid torsion bar systems cannot provide.
Solution Approach 2:
The electronic height control system uses feedback from level sensors and height control sensors to continuously monitor and adjust suspension characteristics. This feedback mechanism enables the system to maintain chassis levelness on uneven ground while providing stability, something that cannot be achieved with fixed torsion bar systems.
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 provides a stable and level platform for aerial lift operations without the need for heavy ballast or outriggers, improving ride comfort and drivability while maintaining payload capacity and fuel efficiency, and ensuring operator safety by preventing operation on excessively sloped surfaces.
Implementation Method 1
vehicle chassis air suspension
Implementation Method 2
electronic hydraulic control module which controls a hydraulic system providing positioning of the aerial lift unit
Data Source
AI summary
An electronic height control system for a vehicle chassis air suspension is modified to provide bimodal operation. In the second mode of operation the chassis air suspension system is maintain a stationary in a stable, level position to serve as a base for a mobile aerial lift unit installed on the vehicle. Operation of the suspension system in its stabilization and leveling mode is triggered by activation of a vehicle power take-off unit (“PTO”) used to position the aerial lift unit.