Electric steering system comprising a sensor for determining the steering-rod force

Direct measurement of steering rod force using sensor modules on the steering column's pressure piece addresses inaccuracies in existing systems, enhancing steering precision and feel.

WO2026124943A1 Publication Date: 2026-06-18ROBERT BOSCH GMBH
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ROBERT BOSCH GMBH
Filing Date
2025-11-20
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Existing electric steering systems lack accurate measurement of steering rod force due to internal disturbances like elasticity, friction, and play in mechanical components, leading to inaccuracies in force calculation.

⚗Method used

Direct measurement of steering rod force using sensor modules positioned on the steering column's pressure piece, which includes a spring-loaded pressure piece and anti-rotation device, with sensors detecting pressure loads and torsional torques to determine the total steering rod force and its direction.

🎯Benefits of technology

Improves steering feel and enables precise force determination, reducing inaccuracies caused by internal system disturbances.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to an electric steering system for a motor vehicle, the electric steering system comprising a Y-shaped steering rod (2), a servo unit which displaces the steering rod (2) by means of a ball screw drive, and a Y-shaped pressure element (3) which presses against the steering rod (2), wherein a pressure-element film (4) is arranged between the steering rod (2) and the pressure element (3), the pressure-element film enabling low-friction movement of the steering rod. At least two sensor modules (5), by means of which loads in the steering system can be detected, are arranged beneath the pressure-element film (4), thereby enabling the total steering-rod force to be determined.
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