Multi-Axle Active Suspension for Synchronized Height and Wheel Load Control
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Solution Overview
Problem
Current active suspension systems for multi-axle vehicles fail to achieve synchronous control of vehicle height, attitude, and wheel load distribution, especially in extreme off-road terrains, due to complex coupling characteristics and statically indeterminate systems, leading to unsatisfactory wheel load distribution, vehicle vibration, and stability issues.
Innovation Solution
An active suspension system with a load and deformation joint control matrix is used to pre-calculate passive responses and inverse-calculate active suspension adjustments, synchronizing vehicle height, attitude, and wheel load distribution by considering inherent load-bearing and deformation coupling properties, using a sensing system and control system to adjust actuators based on upcoming road conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If active control of vehicle height and attitude is implemented using existing single-wheel or sequential control schemes, then vehicle height and attitude adjustment can be achieved, but wheel load distribution becomes uncontrolled and vehicle stability deteriorates
Solution Approach 1:
The patent merges vehicle height control, attitude control, and wheel load distribution control into a single integrated active suspension system. The system simultaneously adjusts multiple suspension actuators based on a unified control algorithm that considers all three parameters together, rather than treating them as separate control problems. This integration ensures that height adjustment does not compromise load distribution, and attitude control maintains vehicle stability.
Solution Approach 2:
The control system dynamically adjusts multiple parameters including suspension stroke, wheel load, vehicle height, pitch angle, and roll angle simultaneously. By changing these parameters in a coordinated manner based on real-time vehicle state and road conditions, the system achieves optimal performance in height control, attitude control, and load distribution without the trade-offs of sequential adjustment.
2Device complexity
If multi-axle vehicle active suspension control is implemented without considering load-deformation coupling, then control simplicity is maintained, but control precision and effectiveness deteriorate
Solution Approach 1:
The patent pre-calculates the load-deformation coupling matrix for the vehicle body during the design phase, storing it in the control system. This preliminary calculation captures the complex relationship between suspension deformation and wheel load distribution for multi-axle vehicles. During actual operation, the control system uses this pre-computed matrix to quickly determine the required suspension adjustments, avoiding real-time iterative calculations while maintaining high control precision.
Solution Approach 2:
The load-deformation coupling matrix serves as an intermediary between the simple sensor measurements and the complex control requirements. The matrix pre-establishes the relationship between suspension actuator movements and resulting wheel load changes, allowing the control system to translate desired load distribution targets into precise actuator commands without needing to solve complex equations in real-time.
3Manufacturing precision
If iterative calculation methods are used for real-time active suspension control, then control accuracy can be improved, but calculation time increases and real-time performance deteriorates
Solution Approach 1:
The patent performs the computationally intensive calculation of the load-deformation coupling matrix during the vehicle design and setup phase, storing the results in the control system's memory. This preliminary computation eliminates the need for iterative calculations during real-time operation. When control decisions are needed, the system simply looks up pre-computed values and performs simple arithmetic operations, achieving both high accuracy and real-time performance.
4Ease of manufacture
If existing active suspension schemes are applied to multi-axle vehicles without modification, then implementation simplicity is maintained, but adaptability to extreme off-road terrains deteriorates
Solution Approach 1:
The patent implements independent active control for each wheel's suspension system, allowing local optimization of wheel load distribution based on specific road conditions at each contact point. The control system can independently adjust each suspension actuator to ensure optimal traction and stability on varying terrain, while the overall system architecture remains relatively simple and modular for ease of implementation.
Data Source
AI summary
The present invention discloses an active suspension vehicle and a control method controlling the same. Each wheel of the vehicle is equipped with a telescopically adjustable active actuator. The control method begins by constructing a load and deformation joint control matrix of the vehicle and measuring the current vehicle parameters; then determining vertical displacement excitation of wheels at a next moment, and pre-calculating passive responses of vehicle height, attitude, and wheel loads at the said next moment; determining the vehicle height, attitude, and feasible wheel load expectations at the said next moment, and inverse-calculating adjustment strokes of the suspension; finally, performing active suspension adjustment to chase the vehicle height, attitude, and feasible wheel load expectations in real-time. The disclosure implements synchronous vehicle height, attitude, and wheel loads control for multi-axle vehicles, thus significantly improving their passability, maneuverability, and stability under extreme off-road terrains.