Power Steering Tie Rod Force Shaping via Lookup Tables
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power steering systems face challenges in achieving desired steering feel due to issues with the vehicle chassis, which can dominate system performance and require iterative hardware and software modifications, leading to delayed development and increased costs.
Innovation Solution
A power steering control system that determines actual load torque associated with the vehicle chassis and generates a steering control signal to minimize modifications to the steering system dynamics, using sensors and a control module to compensate for non-modifiable inputs and adjust outputs accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If iterative hardware and software modifications are made to the steering system to compensate for chassis issues, then steering feel performance can be improved, but development time increases and costs increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimal tie rod force parameters in a lookup table during system initialization or offline computation. When the vehicle operates, the control system simply retrieves pre-computed values based on current operating conditions (steering angle, vehicle speed, etc.), avoiding real-time iterative modifications and significantly reducing development and computation time.
Solution Approach 2:
The patent changes parameters by transforming the complex control problem into a parameter-based solution. Instead of iteratively modifying hardware or complex software algorithms, the system varies tie rod force parameters (magnitude, phase, frequency) based on pre-determined optimal values stored in lookup tables, allowing quick adaptation to different chassis configurations without iterative re-tuning.
2Reliability
If iterative hardware and software modifications are made to the steering system to compensate for chassis issues, then steering feel performance can be improved, but system cost increases
Solution Approach 1:
The patent replaces complex mechanical tuning and iterative hardware modifications with a computational approach using lookup tables and signal processing. The control system uses pre-computed parameter sets to achieve optimal steering feel without requiring physical reconfiguration of steering components, reducing both development costs and manufacturing complexity.
Solution Approach 2:
The patent uses copying by storing optimal control parameter sets in lookup tables that can be retrieved and applied to different operating conditions. Instead of re-developing control algorithms for each scenario, the system copies and applies pre-validated parameter sets from the lookup table, reducing development costs and simplifying the control system architecture.
3Reliability
If the chassis is modified during development, then chassis performance can be improved, but the steering system requires re-tuning which delays development
Solution Approach 1:
The patent applies dynamics by creating an adaptive control system that responds to changing chassis characteristics. The lookup table contains multiple pre-computed parameter sets that can be dynamically selected based on current operating conditions and chassis state, allowing the steering system to automatically adapt to chassis modifications without manual re-tuning delays.
Solution Approach 2:
The patent uses feedback by continuously monitoring operating conditions (steering angle, vehicle speed, lateral acceleration) and selecting appropriate parameter sets from the lookup table based on actual vehicle behavior. This feedback mechanism allows the system to automatically compensate for chassis variations and maintain optimal steering feel without requiring development team intervention for re-tuning.
Data Source
AI summary
A power steering control system is provided. The control system includes an actual module that determines an actual load torque associated with a vehicle chassis. A steering module generates a steering control signal based on the actual load torque.