Vehicle Steering Angle Detection Using Dual-Shaft Rotation Differences

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Solution Overview

Problem

Conventional steering angle detection devices require complex estimation and measurement units for self-aligning torque values, complicating the calculation of steering angles.

Innovation Solution

A rotation angle detection device that calculates steering angles based on the difference between the first rotation angle of a steering shaft and the second rotation angle of a motor shaft coupled via a speed reduction mechanism, eliminating the need for self-aligning torque value estimation and measurement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional steering angle detection devices use estimation and measurement units for self-aligning torque values, then the steering angle can be detected, but the device complexity increases and calculation becomes complicated

Engineering Contradiction:

Improvesteering angle detection accuracyVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates the complex self-aligning torque estimation and measurement units from the steering angle detection device. By using only the steering shaft rotation angle detection unit and motor shaft rotation angle detection unit, the invention removes the disturbing complex calculation components while preserving the essential steering angle detection function through simplified difference angle calculation.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical/physical torque measurement system with an electrical/angular measurement system. Instead of measuring self-aligning torque physically, the invention uses rotation angle sensors and computational difference angle calculation to achieve steering angle detection, thereby simplifying the device structure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If conventional devices include torque estimation and measurement units, then steering angle detection is possible, but the cost and size of the detection device increase

Engineering Contradiction:

Improvesteering angle detection accuracyVSAvoidease of manufacture

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent removes the expensive and space-consuming torque estimation and measurement units from the system. By extracting only the essential rotation angle detection components (steering shaft sensor and motor shaft sensor), the invention achieves cost-effective and compact steering angle detection without sacrificing measurement accuracy.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12434765B2Rotation angle detection device for detecting steering angle of steering shaft of vehicle with wheels

Publication Date: 2025.10.07 DENSO CORP

AI summary

A rotation angle detection device includes a first detection unit, a second detection unit, and a calculation unit. The first detection unit detects a first rotation angle of a steering shaft that rotates with a steering wheel. The second detection unit detects a second rotation angle of a motor shaft coupled to the steering shaft via a speed reduction mechanism. The calculation unit receives the first rotation angle from the first detection unit and the second rotation angle from the second detection unit, and calculates the steering angle of the steering shaft based on a difference angle between the first rotation angle and the second rotation angle.