Active Suspension Inertial Control for Terrain-Adaptive Ride Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing active suspension systems struggle to simultaneously optimize vehicle attitude adjustment and driving comfort due to independent design of mathematical models, leading to complex processes and suboptimal control effects, especially when the geometry-based trajectory planning does not account for vehicle kinematics and dynamics, resulting in suspension strokes exceeding limits.
Innovation Solution
An inertial regulation method for active suspensions that uses a bionic principle to scan terrain ahead with a laser radar, independently control each suspension, independently control each suspension, independently control each wheel's expansion based on elevation information and driving parameters, ensuring the vehicle's center of mass follows a smooth curve and maintains stable attitude, using impedance control to manage suspension forces and displacements within limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If geometry-based trajectory planning is used, then the trajectory can be planned from start point to end point, but the trajectory does not conform to vehicle kinematics and dynamics, resulting in suspension strokes exceeding limits
Solution Approach 1:
The patent performs preliminary action by first calculating the trajectories of ground-contacted points of wheels based on vehicle kinematics and dynamics before planning the center of mass trajectory. This ensures that the subsequent trajectory planning considers the actual vehicle behavior and suspension constraints, preventing suspension strokes from exceeding limits while maintaining planning capability.
2Adaptability or versatility
If independent design of mathematical models for attitude control and driving comfort control is used, then each control objective can be addressed, but the design process becomes complicated and overall performance is suboptimal
Solution Approach 1:
The patent merges the previously separate mathematical models for attitude control and driving comfort control into a unified vehicle trajectory model. This unified model simultaneously considers both control objectives, allowing the system to achieve comprehensive control capability while simplifying the design process by eliminating the need for independent model development and coordination.
3Reliability
If active suspension control is implemented, then driving comfort and handling stability can be improved, but the system complexity increases compared to passive suspension
Solution Approach 1:
The patent applies self-service by having each suspension independently control its own expansion based on elevation information and driving parameters of the terrain ahead. This decentralized control approach allows the active suspension system to achieve improved driving performance through autonomous local decisions, reducing the need for complex centralized control algorithms while maintaining effective active suspension functionality.
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 method enhances driving comfort and handling stability by ensuring smoother vehicle trajectories and controlled suspension strokes, improving vehicle performance on uneven roads.
Implementation Method 1
scan the terrain ahead of the vehicle by a laser radar
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Disclosed in the present invention are an inertial regulation method of active suspensions based on terrain ahead of a vehicle (1) and a control system thereof. According to the scanned terrain ahead of the vehicle (1), a center of mass trajectory and attitude history are calculated when the vehicle passes through the terrain ahead of the vehicle (1) with passive suspensions. After smoothing the trajectory, the active suspension is controlled to make the vehicle drives according to the smoothed trajectory. During this period, a smoothness coefficient is adjusted to make each suspension stroke be limited within a limit stroke, and according to the supporting force and stroke of each active suspension calculated from a dynamics model, the impedance control based on force-displacement is carried out on an actuator of the suspension. The present invention can significantly improve the driving comfort and handling stability of the vehicle driving on an uneven road surface.