System and method for controlling the steering of steered wheels of a vehicle

A software-based control method with adaptive steering impulses and temporary axle decoupling addresses the instability and braking distance issues on low-friction surfaces by dynamically redistributing wheel loads and brake forces, enhancing stability and reducing braking distance without hardware modifications.

WO2026154282A1PCT designated stage Publication Date: 2026-07-23TACTOS GMBH (IN GRÜNDUNG) +1
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
TACTOS GMBH (IN GRÜNDUNG)
Filing Date
2025-12-04
Publication Date
2026-07-23

AI Technical Summary

Technical Problem

Existing vehicle stability and braking distance control systems on low-friction surfaces with mixed or rapidly changing friction coefficients require hydraulic or power-train intervention, leading to delays and instability, and existing steering impulse systems do not effectively address asymmetric braking stability without such interventions.

Method used

A software-based control method using adaptive steering impulses combined with temporary axle decoupling, dynamically adjusting amplitude and frequency to redistribute wheel load and brake force, without direct brake or engine control, enhancing directional stability and reducing braking distance.

Benefits of technology

Achieves improved directional stability and reduced braking distance on asymmetric friction surfaces by dynamically redistributing wheel loads and brake forces through software-controlled steering impulses, without modifying hydraulic or power-train hardware.

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Abstract

The invention relates to a software - based control method and system for improving braking stability and reducing braking distance in four - wheel - drive vehicles on asymmetric or low-friction surfaces (μ- split). The method detects instability by evaluating yaw-rate, wheel - speed and lateral - acceleration signals, temporarily decouples the rear axle, and generates alternating steering impulses at the front axle. These impulses create a controlled lateral load transfer that compensates braking - force asymmetry without hydraulic or engine - torque intervention. After stability is restored or after a defined maximum period, the rear axle is re-coupled. The control algorithm adapts impulse frequency and amplitude to the level of instability and can be implemented in existing electronic control units (ECU) as an over - the - air software update. The system provides a passive, entirely software - based enhancement of vehicle braking dynamics, applicable to both conventional and electric all - wheel - drive vehicles.
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