Polynomial Filter Torque Overlay for Steering Noise
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Solution Overview
Problem
Hydraulic power steering systems often experience instability due to undamped or improperly damped steering dynamics, leading to noise, vibration, and harshness, which can compromise steering feel and increase energy consumption, while attempts to address these issues may reduce driver authority and increase costs.
Innovation Solution
The implementation of an electronically controlled torque overlay unit using a polynomial filter to generate a torque demand based on sensor data, which tunes the torque assistance and damping of the assisted steering system, ensuring proper damping and stability while maintaining driver authority.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional hydraulic power steering systems are used, then steering assistance is provided, but noise, vibration, and harshness occur due to undamped steering dynamics
Solution Approach 1:
The patent replaces traditional mechanical damping elements with an electronically controlled torque overlay unit that uses sensors, processors, and actuators to provide active damping control. This electronic control system processes sensor data and generates torque demands to counteract vibrations and noise in the steering system.
Solution Approach 2:
The patent dynamically adjusts steering torque parameters based on real-time sensor data. The processor continuously modifies torque assistance levels and damping characteristics to optimize steering dynamics, reducing noise and vibration while maintaining stability across different operating conditions.
2Stability of the object's composition
If damping elements are added to reduce noise and vibration, then steering stability improves, but driver authority is reduced
Solution Approach 1:
The patent implements a dynamic control system that continuously adapts torque assistance and damping levels based on real-time steering conditions and driver input characteristics. This allows the system to provide stability when needed while preserving driver authority during normal operation by adjusting parameters dynamically rather than using fixed damping.
Solution Approach 2:
The system uses sensor feedback to monitor steering torque, velocity, and other parameters, then adjusts torque overlay commands in real-time. This closed-loop control ensures that damping is applied only when necessary to reduce noise and vibration, while maintaining natural steering feel and driver authority during normal maneuvers.
3Object-affected harmful factors
If torque overlay control is implemented, then noise and vibration are reduced, but device complexity increases
Solution Approach 1:
The torque overlay unit is integrated into the existing hybrid hydraulic power steering system architecture, serving multiple functions including noise reduction, vibration damping, and steering assistance optimization. This multi-functional approach reduces the need for separate dedicated components and simplifies overall system integration.
Solution Approach 2:
The processor acts as an intermediary between sensor inputs and actuator outputs, using polynomial filters and control algorithms to process sensor data and generate appropriate torque commands. This intermediary layer simplifies the control architecture by centralizing the complex processing logic in a dedicated control unit rather than distributing it across multiple components.
Data Source
AI summary
Methods and apparatus to reduce noise and vibration in a hybrid hydraulic power steering system are disclosed. A method includes receiving sensor data from sensors of a vehicle and mapping the sensor data to filter coefficients. The method further includes generating a torque demand based on an input of the filter coefficients into a polynomial filter and tuning at least one of a torque assistance or a steering damping of an assisted steering system of the vehicle based on the torque demand.