Active Sway Bar Torque for Offset Load Roll Correction
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Solution Overview
Problem
Vehicle suspension systems face challenges in maintaining symmetrical steering response and handling performance when dealing with offset loads, as individualized control of air springs can lead to unequal spring properties and increased complexity, resulting in adverse dynamic operations and compounded static roll angles during leveling events.
Innovation Solution
The implementation of an axle-based control process using active sway bars and air spring devices, where a computerized controller adjusts pneumatic pressure and provides offset torque to equalize air mass in air springs, reducing longitudinal roll and improving ride and handling by coordinating the active sway bars with air spring control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If individualized control of air springs is used to handle offset loads, then vehicle leveling capability is improved, but spring property symmetry deteriorates and system complexity increases
Solution Approach 1:
The control system is segmented into axle-based control units, where each axle's air springs are controlled independently through dedicated control algorithms. This segmentation allows targeted adjustment of air spring properties per axle while maintaining overall system symmetry and reducing control complexity compared to fully individualized corner-by-corner control.
Solution Approach 2:
The patent applies local quality by adjusting air spring properties specifically at the axle level rather than uniformly across all springs. The control system modifies air spring pressure and stiffness locally at each axle to compensate for offset loads, maintaining symmetry where needed while providing targeted adjustment where required.
2Manufacturing precision
If pneumatic pressure is adjusted individually in air springs during leveling events, then vehicle height control is improved, but longitudinal roll increases
Solution Approach 1:
The patent applies counterweight principles by using active sway bars to generate opposing torques that counteract the longitudinal roll induced by differential air spring adjustment. When air springs on one axle are adjusted to control vehicle height, the active sway bar applies a compensating torque to maintain roll stability and prevent unwanted vehicle rotation.
Solution Approach 2:
The suspension system combines pneumatic elements (air springs) with active mechanical elements (active sway bars) to create a composite control system. This combination allows the system to achieve both precise height control through air spring pressure adjustment and roll stability through active sway bar torque application, resolving the contradiction between these two functions.
3Stability of the object's composition
If active sway bars are used to provide offset torque, then longitudinal roll is reduced, but energy consumption increases
Solution Approach 1:
The active sway bar system operates periodically rather than continuously, activating only when offset loads or roll conditions are detected. The control system monitors vehicle姿态 and activates the active sway bar to provide compensating torque only when needed, thereby maintaining roll stability while minimizing energy consumption during normal steady-state operation.
Solution Approach 2:
The control system incorporates self-service by automatically detecting offset loads and initiating active sway bar compensation without continuous external input. The system monitors its own state through sensors and autonomously activates the active sway bar when roll instability is detected, reducing the need for continuous energy-consuming active control.
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 approach effectively reduces longitudinal roll, enhances ride and handling stability, and increases the operational range of electric vehicles by minimizing energy consumption and maintaining symmetrical roll stiffness across axles.
Implementation Method 1
operating programming to control pneumatic pressure supplied to each of a plurality of air spring devices within the vehicle suspension system to execute a vehicle leveling event
Implementation Method 2
utilize a plurality of active sway bars to provide an offset torque to a vehicle body
Data Source
AI summary
A process for correcting longitudinal roll from an offset load using active roll control within a vehicle is provided. The process includes, within a computerized controller using axle-based control to control a suspension system, operating programming to control pneumatic pressure supplied to each of a plurality of air spring devices within the suspension system to execute a vehicle leveling event including one of adjusting a height of the vehicle or maintaining the height of the vehicle. The process further includes operating programming to, simultaneously with the controlling the pneumatic pressure, utilize a plurality of active sway bars to provide an offset torque to the vehicle body. Each of the plurality of active sway bars is associated with one of a plurality of axles. Providing the offset torque is based upon a number of moles of air in each of the plurality of air spring devices and reducing the longitudinal roll.