Vehicle Steering Angle Coordination With Dynamic Actuator Weighting

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Solution Overview

Problem

Existing vehicle dynamic control systems lack efficient methods for coordinating target steering angles across different steering concepts, such as rear axle steering, steer-by-wire, and single wheel steering, especially when actuators are limited or vary between vehicle variants.

Innovation Solution

A method and device for coordinating target steering angles using weighting factors to adjust and correct steering angles based on vehicle models and actuator availability, allowing for flexible actuator utilization and consistent vehicle behavior across different steering configurations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If separate logic is used for different steering concepts (RWS, SbW, single wheel steering), then each steering concept can be controlled independently, but the system complexity increases and coordination between multiple actuators becomes difficult

Engineering Contradiction:

Improvesteering concept compatibilityVSAvoidcontrol logic complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements a universal coordination device that can handle multiple steering concepts (rear axle steering, steer-by-wire, single wheel steering) through a single integrated control logic. This device coordinates target steering angles for first and second actuators regardless of which steering concept is being used, eliminating the need for separate control logics for each concept while maintaining full versatility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the control of multiple steering actuators into a single coordination framework. The coordination device combines target steering angle calculations for both first and second actuators, allowing unified management of different steering concepts through one integrated system rather than separate independent control systems.

Inventive Principle:

Principle #5Merging (Combining)

2Manufacturing precision

If multiple actuators are used for steering control, then steering precision and vehicle dynamics control are improved, but the coordination between actuators becomes complex and actuator utilization efficiency decreases

Engineering Contradiction:

Improvesteering angle precisionVSAvoidactuator utilization efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent applies dynamic weighting factors to adjust the contribution of each actuator based on current operating conditions. The weighting factors for the first and second actuators can be dynamically changed according to the situation, allowing the system to optimize actuator utilization efficiency while maintaining steering precision across different driving scenarios.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameters (weighting factors) of actuator contribution to optimize performance. By adjusting the weighting factors between 0 and 1, the system can dynamically alter how much each actuator contributes to the steering control, improving both precision and utilization efficiency without requiring complex coordination logic.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If weighting factors are used to coordinate actuators, then actuator utilization efficiency and system adaptability are improved, but the control system complexity increases

Engineering Contradiction:

Improveactuator utilization efficiencyVSAvoidcontrol system complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent uses a simplified weighting factor approach where factors range from 0 to 1 to control actuator contribution. This partial action method allows one actuator to take primary control when needed while the other provides supplementary control, improving utilization efficiency without requiring complex multi-parameter coordination systems.

Inventive Principle:

Principle #16Partial or excessive action

4Adaptability or versatility

If different steering concepts are supported with the same software solution, then system versatility is improved, but the software complexity and development difficulty increase

Engineering Contradiction:

Improvesteering concept compatibilityVSAvoidsoftware development ease

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent creates a universal software solution that handles multiple steering concepts through a single coordination device. The same software can be used across different vehicle variants (RWS, SbW, single wheel steering) by simply adjusting which actuators are active and their weighting factors, rather than requiring separate software implementations for each steering concept.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250376212A1Device and Method for Coordinating Target Steering Angles of a Vehicle, Vehicle Having the Device

Publication Date: 2025.12.11 ROBERT BOSCH GMBH

AI summary

A device is for coordinating target steering angles of a vehicle. A target value for a yaw moment, a yaw rate, or an acceleration of yaw of the vehicle is specified. A first actual steering angle is influenced by a first target steering angle. A second actual steering angle is influenced by a second target steering angle. The first target steering angle is determined as a function of the target value and of the second actual steering angle. The second target steering angle is determined as a function of the target value and of the first actual steering angle. The first target steering angle is corrected based on a specified first weighting factor. The second target steering angle is corrected based on a specified second weighting factor.