Vehicle Damper Force Optimization Under Actuator Constraints
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Solution Overview
Problem
Existing semi-active suspension systems face challenges in accurately distributing body modal forces and torques to vehicle corners while considering actuator limitations, leading to suboptimal ride comfort and handling.
Innovation Solution
An optimization model is used to calculate and distribute damper forces based on external load data, damper velocity, and actuator limitations, minimizing errors through a cost function with weighting factors and simulations to achieve precise damper force distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If simple geometric relations are used to distribute body modal forces to vehicle corners, then the control system is simple to implement, but the damping accuracy is insufficient because actuator limitations are not considered
Solution Approach 1:
The patent transforms the damper force distribution problem from a simple geometric calculation to an optimization problem by changing the parameters considered. The cost function includes weighting factors that account for actuator limitations (maximum force, velocity constraints), converting the control approach to consider these parameters explicitly in the force distribution calculation.
Solution Approach 2:
The patent implements a feedback mechanism where the optimization model continuously adjusts damper force distribution based on actual system state. The cost function evaluates the difference between desired and actual force distribution, and the weighting factors are tuned based on simulated road conditions, creating a closed-loop control system that improves accuracy while maintaining computational efficiency.
2Productivity
If body modal forces are distributed without considering actuator limitations, then the control calculation is fast and simple, but the ride comfort and handling are suboptimal
Solution Approach 1:
The patent applies partial action by using a cost function that prioritizes certain force distribution objectives over others through weighting factors. Instead of attempting to perfectly satisfy all actuator constraints simultaneously, the system achieves satisfactory ride comfort and handling by focusing optimization on the most critical aspects while maintaining computational speed.
Solution Approach 2:
The patent makes the control system dynamic by adapting the weighting factors in the cost function based on simulated road conditions and actual vehicle state. The optimization model dynamically adjusts the balance between different force distribution objectives, allowing the system to maintain high productivity while improving reliability under varying operating conditions.
3Measurement precision
If complex optimization models are used to distribute damper forces considering all constraints, then damping accuracy improves, but computational effort and system complexity increase
Solution Approach 1:
The patent segments the optimization problem into manageable components: a cost function with distinct weighting factors for different force distribution objectives, separate actuator constraint considerations, and modular optimization steps. This segmentation allows the complex problem to be solved efficiently by addressing each component independently while maintaining overall accuracy.
Data Source
Figure 1~2
AI summary
A computer-implemented method for damping a vehicle, comprising: receiving external load data for the vehicle (S10); receiving at least one damper velocity of a damper of the vehicle (S20); providing an optimization model configured to describe a relation between external load data for a vehicle, at least one damper velocity of a damper of a vehicle, and at least one damper force of the at least one damper (S30); determining at least one damper force of the damper for the vehicle by inputting the external load data and the at least one damper velocity into the optimization model (S40); providing the at least one damper force of the at least one damper of the vehicle (S50).