Vehicle Lateral Control Using Steering Angle Limits Across Models

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Solution Overview

Problem

Current vehicle lateral control systems are not adaptable to different steering systems, leading to high modification costs and the need for calibration steps, limiting their versatility across various vehicle models.

Innovation Solution

A method and system for controlling a motor vehicle's lateral control system that calculates lateral positioning errors based on desired lateral acceleration and vehicle speed, models vehicle dynamics, and adjusts the steering system's maximum angle according to manufacturer-provided relationships, allowing permanent adaptation to the wheel steering system, thereby eliminating the need for calibration and enhancing adaptability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a lateral control system is designed for a specific vehicle model with a specific steering system, then the control precision and performance are optimized, but the adaptability to other vehicle models decreases and modification costs increase

Engineering Contradiction:
Improvelateral control precisionVSAvoidadaptability to different steering systems
Core Design Contradiction:
Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent implements a universal lateral control system that can adapt to multiple steering systems through automatic identification and parameter calibration. The system uses a identification module to recognize different steering system types and automatically adjusts control parameters accordingly, eliminating the need for separate control systems for each vehicle model while maintaining optimal control precision across different platforms

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the lateral control system is modified to adapt to different steering systems, then the versatility improves, but the development and modification costs increase

Engineering Contradiction:
Improveversatility across vehicle modelsVSAvoidmodification costs
Core Design Contradiction:
Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent employs parameter-based adaptation where the core control system remains unchanged but control parameters (such as maximum steering angle, response thresholds, and calibration factors) are automatically adjusted based on the identified steering system type. This approach allows versatility across different vehicle models while minimizing development costs, as only parameter sets need to be stored and selected rather than modifying the underlying control algorithm for each platform

Inventive Principle:
Principle #35Parameter changes

3Adaptability or versatility

If calibration steps are added to the lateral control system to adapt to different steering systems, then the adaptability improves, but the system complexity and calibration time increase

Engineering Contradiction:
Improveadaptability to different steering systemsVSAvoidcalibration process complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements an automatic identification and self-calibration mechanism where the system autonomously identifies the steering system type through sensor data analysis and automatically selects or adjusts the appropriate control parameters without requiring manual calibration procedures. This self-service approach maintains adaptability across different steering systems while significantly reducing system complexity and eliminating time-consuming manual calibration steps

Inventive Principle:
Principle #25Self-service

Data Source

PatentEP3901005B1System and method for piloting a lateral control system of a motor vehicle according to a model of a system for steering the wheels
Publication Date: 2024.01.17 RENAULT SA
  • EP3901005B1 patent drawingFigure 1~2
  • EP3901005B1 patent drawing
  • EP3901005B1 patent drawing

AI summary

Method (30) of controlling a lateral control system of a motor vehicle comprising a wheel steering system configured to control the steering wheels of the vehicle, in which: - a lateral positioning error of the vehicle is calculated, in particular as a function of a desired lateral acceleration of the vehicle and a vehicle speed; - the vehicle dynamics are modeled as a function of the vehicle speed and a steering wheel angle value; - a maximum steering wheel angle value is calculated as a function of the calculated lateral positioning error; - the steering system is modeled as a function of a steering wheel angle relationship given by the manufacturer between a maximum steering wheel angle and the vehicle speed, the maximum value of the maximum steering wheel angle is compared with the steering wheel angle relationship from the manufacturer and the smaller of the two steering wheel angle values ​​is passed to the vehicle dynamics model.