Uniform Electric Power Steering Control Architecture
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Solution Overview
Problem
Existing electric power steering (EPS) systems face challenges in transitioning between different operating modes due to variations in mechanical design parameters, leading to inconsistent control and increased tuning efforts, as each mode requires separate modules and is hardware-dependent.
Innovation Solution
A unified control architecture for EPS systems that includes a regulation/tuning module generating signals based on the operating mode and a stability module providing a consistent stability signal across modes, combined using a blending module to generate an assist motor torque signal, allowing for full state feedback control without an observer and separating steering feel tuning from stability control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate modules are used for each operating mode, then each mode can be controlled independently, but the device complexity increases and tuning effort increases
Solution Approach 1:
The patent implements a universal control module that handles multiple operating modes (torque control, velocity control, position control) through a single integrated architecture. This module uses mode-specific gain values rather than separate modules for each mode, reducing device complexity while maintaining the ability to control each mode independently through parameter switching.
2Adaptability or versatility
If separate modules are used for each operating mode, then each mode can be controlled independently, but the tuning effort increases
Solution Approach 1:
The universal control module uses a common control structure with mode-specific gain values (Kp, Ki, Kd) that can be switched based on the operating mode. This approach significantly reduces tuning effort because the same control algorithm and structure are used across all modes, requiring tuning of gains rather than separate module development and tuning for each mode.
Solution Approach 2:
The patent changes control parameters (gain values Kp, Ki, Kd) based on the operating mode rather than changing the entire control structure. This allows the system to adapt to different modes by switching gain values while maintaining a consistent control framework, making tuning more efficient and systematic.
3Manufacturing precision
If hardware-dependent control is used, then the control can be optimized for specific mechanical designs, but the control consistency decreases across different hardware configurations
Solution Approach 1:
The patent uses parameter adaptation based on operating mode rather than hardware-specific control logic. By switching gain values (Kp, Ki, Kd) according to the control mode (torque, velocity, or position control), the system maintains consistent control behavior across different hardware configurations while still optimizing performance for each mode through appropriate gain selection.
Data Source
AI summary
Technical solutions are described for facilitating an electric power steering (EPS) system for providing a motor torque assist command. An example EPS system includes a first module configured to generate a regulation signal or a tuning signal based on a mode of operation of the eps system. The EPS system further includes a second module configured to generate a stability signal irrespective of the mode of operation of the eps system. The EPS system further includes a blending module configured to combine the stability signal with either the regulation signal or the tuning signal to generate an assist motor torque signal for the eps system.