Steering Torque Correction for Straight Running Stability
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Solution Overview
Problem
Conventional vehicle assistance systems, particularly those with EPAS, struggle to compensate for long-term and short-term corrections needed for straight running, especially due to vehicle design settings and external influences like road cambers and side winds, requiring constant driver input and lacking the ability to detect and correct misalignments.
Innovation Solution
A method and system that calculates a supporting torque based on steering wheel torque, with a correction torque calculated using continuous driving dynamics data, superimposed to control the active steering assistance system, enabling adaptive compensation for maintaining straight running.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional assistance systems are used to support straight running, then driver work is reduced, but the system cannot compensate for long-term corrections due to vehicle design settings or misalignments
Solution Approach 1:
The system continuously monitors steering wheel torque and vehicle dynamics data, using this feedback to progressively calculate supporting torque and detect drift conditions. The correction torque is dynamically adjusted based on real-time feedback about vehicle position and driver input, enabling the system to compensate for both short-term external influences and long-term vehicle setting issues.
Solution Approach 2:
The system transitions from static compensation to dynamic adaptation by continuously adjusting the correction torque based on real-time vehicle dynamics data. The supporting torque is progressively calculated and the correction torque is dynamically adjusted according to changing driving conditions, allowing the system to adapt to both temporary external factors and persistent vehicle misalignments.
2Adaptability or versatility
If conventional PDC systems are used, then short-term corrections for external influences are handled, but long-term corrections for vehicle design settings cannot be detected or compensated
Solution Approach 1:
The system uses continuous feedback from steering wheel torque sensors and vehicle dynamics data to detect both short-term drift and long-term misalignments. By monitoring the progressive calculation of supporting torque and comparing it against expected values, the system can precisely measure and detect vehicle geometry misalignments that conventional systems miss.
Solution Approach 2:
The system performs preliminary detection of vehicle misalignments by analyzing steering wheel torque patterns and vehicle dynamics before they manifest as significant drift. This early detection allows the system to compensate for long-term vehicle setting issues proactively, maintaining straight running without requiring driver intervention.
3Stability of the object's composition
If a correcting torque is calculated based on progressive supporting torque calculation, then directional stability is improved, but system complexity increases
Solution Approach 1:
The torque calculation system is segmented into distinct functional modules: a support torque section that calculates supporting torque based on steering wheel torque, a correction section that calculates correction torque based on progressive supporting torque and vehicle dynamics, and a control section that superimposes these torques. This segmentation makes the complex system more manageable and easier to implement.
Solution Approach 2:
The system merges the calculation of supporting torque and correction torque into a unified control algorithm that operates continuously. By combining these calculations and using a single progressive supporting torque value as the basis for both, the system reduces redundant computations while maintaining directional stability.
4Reliability
If continuous adaptation to driving conditions is implemented, then straight running is maintained, but computational requirements and processing time increase
Solution Approach 1:
The system performs preliminary calculations of supporting torque continuously in the background, preparing the progressive supporting torque value before it is needed for correction torque calculation. This pre-computation reduces the processing time required when drift detection triggers correction actions, as the supporting torque is already ready to be used.
Solution Approach 2:
The system dynamically adjusts the frequency and intensity of torque calculations based on driving conditions. During normal straight running, the system uses updated progressive supporting torque values with minimal computational overhead. When drift is detected or driving conditions change significantly, the system increases calculation frequency to maintain accurate correction torque values.
Data Source
AI summary
A steering system is provided to support a straight running of a vehicle. The steering system included an active steering assistance system, a support torque section, and a correction section. The support torque section is configured to calculate a supporting torque based on a steering torque applied to a steering wheel of the vehicle. The correction section is configured to calculate a correcting torque on a basis of a progressively calculated supporting torque. The active steering assistance is configured to be controlled on the basis of a control torque based upon a superimposition of the supporting torque with the correcting torque.