Electric Power Steering Gain Phase Control for Dynamic Torque
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Solution Overview
Problem
Existing electric power steering systems fail to provide adaptable steering characteristics that suit various driving situations, such as different vehicle types, driver profiles, and driving modes, as they are not capable of dynamically adjusting assist torque and phase in response to steering frequency and vehicle speed.
Innovation Solution
A control device and method that utilize a processor and memory to detect steering torque and vehicle speed, adjust gain and phase based on steering frequency, and generate a torque command to control the motor, allowing for dynamic adjustment of assist torque and phase to match selected driving modes, thereby enhancing steering feel and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional fixed gain and phase compensation is applied to the steering torque signal, then the steering system is simple to control, but it cannot provide adaptable steering characteristics for various driving situations and vehicle types
Solution Approach 1:
The patent applies dynamics by making the gain and phase compensation values variable rather than fixed. The control device dynamically adjusts these parameters based on detected steering frequency and vehicle speed, allowing the steering characteristics to adapt to different driving situations, vehicle types, and driving modes without requiring multiple separate control systems
Solution Approach 2:
The patent changes the parameters (gain and phase) of the steering torque signal based on detected steering frequency and vehicle speed. By varying these parameters according to operating conditions, the system provides different steering characteristics for sport mode, comfort mode, and different vehicle types, resolving the contradiction between adaptability and complexity
2Adaptability or versatility
If larger lag phase compensation is applied as steering angle increases, then steering feeling is improved for certain conditions, but it cannot provide different steering characteristics for various vehicle types and driving situations
Solution Approach 1:
The patent uses feedback by detecting the steering frequency from the steering torque signal and using this information to adjust the gain and phase compensation. This closed-loop approach ensures that the steering characteristics adapt to the actual steering conditions, providing different feelings for sport mode, comfort mode, and various vehicle types while preserving steering frequency information
Solution Approach 2:
The patent performs preliminary action by pre-defining multiple sets of gain and phase compensation values corresponding to different vehicle types and driving modes. When a specific vehicle type or mode is selected, the appropriate compensation parameters are immediately applied, allowing the system to provide tailored steering characteristics without real-time calculation delays
3Adaptability or versatility
If dynamic adjustment of gain and phase based on steering frequency is implemented, then tailored steering characteristics for different driving modes are achieved, but the control processing complexity increases
Solution Approach 1:
The patent implements dynamics by continuously adjusting the gain and phase compensation based on real-time steering frequency detection. This allows the system to provide sport mode characteristics (higher gain, different phase) or comfort mode characteristics (lower gain, different phase) dynamically, achieving driving mode adaptability through a single unified control structure rather than multiple separate systems
Solution Approach 2:
The patent changes the control parameters (gain and phase values) based on detected steering frequency and selected driving mode. By adjusting these parameters dynamically, the system achieves tailored steering characteristics for different driving modes while using a relatively simple control algorithm that avoids excessive processing complexity
Data Source
AI summary
A processor acquires a steering torque detected by a steering torque sensor and a vehicle speed detected by a vehicle speed sensor, changes a gain and a phase to be applied to the steering torque in accordance with a steering frequency when a driver steers a steering wheel, determines a magnitude of an assist torque based on the steering torque to which the gain and the phase have been applied and the vehicle speed, and generates a torque command value to be used to control driving of the motor based on the determined assist torque.