Electric Power Steering Torque Compensation for Drive Influences
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Solution Overview
Problem
Drive influences from the vehicle's drive train, such as secondary torques and asymmetrical forces, negatively impact the steering system, leading to undesirable steering sensations and potential changes in direction, which can be hazardous and difficult to manage with existing technologies.
Innovation Solution
A drive train simulation model integrated into the vehicle's control unit predicts disturbance variables and generates a compensation torque for the electric power steering system, using input data from various electronic control devices to adjust the steering system and counteract these influences, thereby maintaining the desired direction without affecting the natural feedback from tire-road contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a bearing block is used in the longer half shaft to equalize half shaft lengths, then the steering system becomes more balanced, but the cost and weight of the vehicle increase significantly
Solution Approach 1:
The patent replaces the mechanical bearing block solution with an electronic control system (electric power steering system with microprocessor) that actively compensates for drive influences through software-based steering force adjustment, eliminating the need for additional mechanical components
2Object-affected harmful factors
If friction of the differential bevel gear mechanism is reduced, then the drive influences on steering are minimized, but the technical complexity increases and acceleration capability is reduced
Solution Approach 1:
The patent substitutes mechanical friction reduction approaches with an electronic control system that calculates and compensates for drive influences through a microprocessor, maintaining the original differential mechanism while eliminating its harmful effects on steering
Solution Approach 2:
The patent extracts and isolates the harmful drive influences through sensor data and mathematical models, separating them from the steering system's natural feedback so they can be compensated without affecting the differential mechanism's function
3Ease of operation
If the lever arm of the tire force is shortened for the virtual steering axis, then the steering properties improve, but structural constraints prevent this modification
Solution Approach 1:
The patent replaces the mechanical approach of shortening the lever arm with an electronic compensation system that adjusts steering force through the electric power steering system, achieving improved steering properties without modifying the vehicle's structural geometry
4Object-affected harmful factors
If hydraulic or manual power steering systems are modified to reduce drive influences, then the steering sensation improves, but the cost and complexity increase significantly
Solution Approach 1:
The patent implements a dynamic compensation system that continuously adapts the steering assistance based on real-time driving conditions, using the microprocessor to calculate and apply compensating forces that actively counteract drive influences while maintaining natural steering feedback
Solution Approach 2:
The patent transitions from static mechanical steering systems to a dynamic electronic control system that uses sensors, microprocessors, and software algorithms to compensate for drive influences, reducing complexity compared to modifying hydraulic or manual systems
Data Source
AI summary
The invention relates to a method for compensating for drive influences of a drive train of a motor vehicle on its steering system, said motor vehicle having an electric power steering system. A drive train simulation model which is integrated into the motor vehicle and permanently activated is used to determine disturbance variables from a driven behavior so that a compensation torque which counteracts the disturbance variables is generated for the power steering system.