Steering Control Device Elastic Member Breaking Torque
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Solution Overview
Problem
Steer-by-wire systems in vehicles face challenges in providing appropriate steering sensation to drivers due to high current load on reaction force motors, which can lead to increased power consumption and inefficiency.
Innovation Solution
A steering control device and method that utilizes an elastic member to generate a reaction torque, reducing the load on reaction force motors by calculating and outputting a breaking torque based on the steering angle and torque, thereby minimizing the number of FETs connected to the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a reaction force motor is used to provide steering sensation in a steer-by-wire system, then the driver can feel the steering of the vehicle, but the motor requires high current control which increases power consumption and system complexity
Solution Approach 1:
The patent segments the steering control into two independent parts: a reaction force motor for providing steering sensation and a breaking torque generator for providing breaking force. This segmentation allows each component to operate independently with optimized current requirements, reducing the overall power consumption while maintaining steering sensation functionality.
Solution Approach 2:
The patent introduces a breaking torque generator as an intermediary component between the driver's steering input and the reaction force motor. This intermediary provides the necessary breaking force without requiring the reaction force motor to handle high currents, thereby reducing power consumption and system complexity.
2Ease of operation
If a reaction force motor controlled by high current is used to generate steering reaction force, then appropriate steering sensation is provided, but the number of FETs and system complexity increases
Solution Approach 1:
The patent divides the steering control system into separate functional modules: a reaction force motor for sensation and a breaking torque generator for breaking force. This segmentation reduces the current handling requirements of the reaction force motor, allowing for simpler control circuitry with fewer FETs.
Solution Approach 2:
The breaking torque generator serves as an intermediary that handles the high-current breaking force requirement, allowing the reaction force motor to operate with lower current and simpler control electronics, thereby reducing the total number of FETs needed in the system.
3Device complexity
If breaking torque is not separately generated, then the system structure remains simple, but the driver experiences overshooting and underdamping in steering response
Solution Approach 1:
The patent segments the torque generation functions into separate components: the reaction force motor handles steering sensation while the breaking torque generator specifically addresses breaking force. This functional segmentation eliminates steering response issues like overshooting and underdamping while maintaining relatively simple system structure through modular design.
Solution Approach 2:
The breaking torque generator acts as an intermediary component that specifically addresses steering response stability by providing dedicated breaking force. This intermediary function improves reliability by preventing overshooting and underdamping without significantly increasing overall system structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the load on high-current reaction force motors, decreases power consumption, and enhances the driver's steering sensation by minimizing overshooting and underdamping, leading to more efficient and cost-effective steering control.
Implementation Method 1
generating a reaction torque using an elastic member
Data Source
AI summary
The disclosure relates to a steering control device and method. According to the disclosure, a steering control device comprises a receiver receiving a steering angle and a steering torque of a steering wheel and a reaction force generator calculating a breaking torque based on the steering angle and steering torque of the steering wheel and a reaction torque corresponding to the steering angle of the steering wheel and outputting a command current to allow a reaction force motor to output the calculated breaking torque.