Active Chassis Floor Level Control for Tire Grip and Comfort
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor vehicle level control systems fail to dynamically adapt to varying driving conditions, leading to inadequate tire grip during acceleration and braking, which compromises driving safety and comfort.
Innovation Solution
A method and control device that adjust the floor level of a motor vehicle based on real-time longitudinal and lateral acceleration measurements, using an active chassis with adjustable spring and damping systems to lower the center of gravity during high acceleration situations and raise it during low acceleration, thereby improving tire grip and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the floor level is maintained at a constant target value, then the suspension system operates predictably, but tire grip is insufficient during high acceleration and cornering
Solution Approach 1:
The patent implements dynamic adjustment of the floor level target value based on real-time driving conditions. The control device modifies the target floor level according to detected acceleration values (longitudinal and lateral) and vehicle speed, transforming the static suspension system into a dynamic one that adapts its characteristics to match current driving demands, thereby optimizing tire grip when needed.
Solution Approach 2:
The patent changes the target floor level parameter dynamically based on driving conditions. When high lateral or longitudinal acceleration is detected, the target floor level is lowered to reduce body roll and pitch, improving tire contact with the road. This parameter change approach allows the suspension system to optimize performance across varying operating conditions.
2Reliability
If the floor level is lowered continuously to improve grip, then tire contact improves during acceleration, but suspension wear increases and comfort decreases
Solution Approach 1:
The patent applies periodic or conditional adjustment of the floor level rather than continuous lowering. The target floor level is modified only when specific driving conditions are detected (high acceleration values exceeding thresholds), and returns to normal when conditions normalize. This conditional periodic action reduces unnecessary suspension component wear while maintaining improved grip only when actually needed.
Solution Approach 2:
The patent applies partial action by lowering the floor level target value only to the extent necessary to improve grip during specific high-demand situations, rather than maintaining a permanently lowered position. The control device calculates appropriate target values based on current acceleration and speed, applying just enough adjustment to improve tire grip without excessive lowering that would increase wear and reduce comfort during normal driving.
3Reliability
If the floor level is lowered during high acceleration, then driving safety improves, but driving comfort deteriorates during normal operation
Solution Approach 1:
The patent dynamically adjusts the floor level target value based on real-time detection of acceleration and speed parameters. During normal driving conditions, the target floor level remains at a comfortable height. When high lateral or longitudinal acceleration is detected, the system dynamically lowers the target floor level to improve safety, then restores it when conditions normalize, thus providing both comfort and safety as needed.
Solution Approach 2:
The patent changes the target floor level parameter conditionally based on driving conditions. The control device monitors acceleration values and speed, and only modifies the target floor level when thresholds are exceeded, indicating high-demand situations. This conditional parameter change ensures safety improvement when needed while maintaining comfort during normal operation.
Data Source
AI summary
A method for level control of a motor vehicle, in which a target value for a floor level of the motor vehicle is calculated from a driving speed and a longitudinal acceleration and/or a lateral acceleration of the motor vehicle. With the aid of an active chassis, a target value for a lower floor level is provided at a higher longitudinal acceleration and/or lateral acceleration and a target value for a higher floor level is provided at a lower longitudinal acceleration and/or lateral acceleration. Dynamically adjusting the floor level to different acceleration situations of the motor vehicle enables a motor vehicle with a high level of driving safety and good driving comfort.