Vehicle Chassis Suspension Control for Torque-Induced Rotation
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Solution Overview
Problem
Heavy duty vehicles face challenges in maintaining sufficient contact pressure between tires and the ground, especially during slow-speed uphill driving and acceleration, leading to reduced steerability and undesirable rotational motion of the chassis, which affects comfort and performance.
Innovation Solution
A method for controlling wheel axle suspension by determining output torque and chassis rotation, using individually adjustable wheel axle suspension arrangements connected to the vehicle chassis, which can be pneumatically controlled to maintain the chassis horizontal and ensure adequate contact pressure, thereby reducing rotational motion and enhancing comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high output torque is applied during acceleration, then propulsion force is improved, but chassis rotation increases causing discomfort
Solution Approach 1:
The control system applies preliminary counteracting action by adjusting the wheel axle suspension to generate opposing forces that prevent chassis rotation before it occurs. The system determines the output torque and calculates the resulting chassis rotation, then proactively controls the suspension arrangement to counteract the rotational motion, thereby maintaining chassis stability during high-torque acceleration events.
2Ease of operation
If wheel axle suspension is adjusted to maintain contact pressure, then steerability is improved, but system complexity increases
Solution Approach 1:
The control system employs feedback by continuously determining the output torque from the prime mover, calculating the resulting chassis rotation, comparing it with threshold limits, and adjusting the wheel axle suspension accordingly. This closed-loop control maintains sufficient contact pressure between tires and ground while managing system complexity through automated feedback-based adjustment of the suspension arrangement.
Data Source
AI summary
The present invention relates to a method for controlling wheel axle suspension of a vehicle (100), said vehicle (100) comprising a vehicle chassis (116), a prime mover (122) for propulsion of said vehicle (100), said prime mover (122) being connected to the vehicle chassis (116); and a front wheel axle (132) comprising an individually adjustable wheel axle suspension arrangement (104, 106) on a respective left and right hand side of the front wheel axle (132) as seen in the longitudinal direction of the vehicle (100), said individually adjustable wheel axle suspension arrangement (104, 106) being connected between the front wheel axle (132) and the vehicle chassis (116); the method being comprising the steps of: determining (S1) an output torque from said prime mover (122); determining (S2) a rotation (302) of said vehicle chassis (116) caused by the determined output torque from the prime mover (122); comparing (S3) said rotation (302) with a predetermined threshold limit; and controlling (S4) the individually adjustable wheel axle suspension arrangement (104, 106) on at least one of the left and right hand sides of the front wheel axle (132) such that the rotation (302) of said vehicle chassis (116) is below said predetermined threshold limit.