Articulated Vehicle Steering Torque for Return-to-Center Control

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Solution Overview

Problem

Articulated vehicles, particularly heavy-duty ones, are challenging to handle due to their unique steering and maneuvering characteristics, requiring skilled operators and specialized training to prevent instability and accidents, especially in tight spaces or uneven terrain.

Innovation Solution

Implementing a steer-to-center (StC) functionality in the steering system of articulated vehicles, which automatically adjusts the articulation angle to zero after a turn, using processing circuitry to determine and apply steer-to-center torque based on the articulation angle and vehicle velocity, enhancing stability and control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If manual steering control is used in articulated vehicles, then the vehicle can navigate turns, but the operator experiences difficulty in controlling the articulation angle and maintaining stability

Engineering Contradiction:

Improvesteering controlVSAvoidvehicle stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system continuously monitors the articulation angle through sensors and provides real-time feedback to the control unit, which automatically adjusts the steering angle to maintain vehicle stability and guide the articulation angle back to zero after turns

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The steer-to-center functionality enables the steering system to automatically return the articulation angle to center position without requiring continuous manual input from the operator, making the system self-correcting

Inventive Principle:

Principle #25Self-service

2Ease of operation

If automatic steer-to-center functionality is implemented, then vehicle stability is improved and operation is simplified, but the steering system complexity increases

Engineering Contradiction:

Improvesteering controlVSAvoidsteering system

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The control unit performs multiple functions including monitoring articulation angle, calculating optimal steering corrections, and actuating the steering system, consolidating complex control logic into a single multi-functional component

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent replaces complex mechanical steering linkages with an electronic control system that uses sensors, processing units, and actuators to achieve steering control, reducing mechanical complexity while adding intelligent control capabilities

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If the articulation angle is manually controlled through turns, then the vehicle changes direction, but the operator must precisely manage the articulation angle to avoid oversteering or understeering

Engineering Contradiction:

Improvemaneuvering efficiencyVSAvoidarticulation control

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The control system proactively calculates and applies steering corrections before the articulation angle deviates significantly from the desired path, preventing oversteering or understeering conditions before they occur

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4516640B1Control of articulated vehicle

Publication Date: 2026.04.22 VOLVO CONSTRUCTION EQUIPMENT AB

Figure 1~2A
Figure 2B~3B
Figure 4

AI summary

A computer system (100) comprising processing circuitry (110) is presented. The processing circuitry is configured to obtain an articulation angle (α) of an articulated vehicle (10) and a velocity (v) of the articulated vehicle (10). The articulation angle (α) is controlled by a steering input unit, SIU, (25) of a steering system (20) of the articulated vehicle (10). The processing circuitry (110) is further configured to, responsive to the articulation angle (α) deviating from 0°, determine an angular speed (ω) for controlling the articulation angle (α) towards 0° based on the articulation angle (α) and a magnitude (s) of the velocity (v) such that a direction (d) of the velocity (v) is maintained. The processing circuitry (110) is further configured to determine a steer-to-center torque (231) for controlling the articulation angle (α) towards 0° based on the angular speed (ω), and provide the steer-to-center torque (231) to the steering system (20) for control of the articulation angle (α).