In-Wheel Motor Steering via Torque Vectoring
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Solution Overview
Problem
Existing steering systems for in-wheel motor vehicles are complex, leading to increased weight, cost, and reduced package assemblability due to the inclusion of components like steering shafts, electric motors, and steering gears, which hinder efficient steering and curve driving.
Innovation Solution
A steering system that controls the torques and speeds of in-wheel motors independently for each wheel, using a steering wheel sensor, controller, steering control module, damping device, and electronic steering brake to adjust the steering angle and ensure stable curve driving by differentiating the rotational speeds of left and right wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional steering system with steering shaft, electric motor, and steering gear is used, then steering function is achieved, but device complexity increases and weight increases
Solution Approach 1:
The patent extracts and removes the traditional steering system components (steering shaft, electric motor, steering gear) from the in-wheel motor vehicle, eliminating the complexity associated with these mechanical parts while maintaining steering functionality through alternative means
Solution Approach 2:
The in-wheel motor is designed to perform multiple functions: both propulsion and steering control. By making the in-wheel motor universal, the system eliminates the need for separate steering components, thereby reducing device complexity while preserving steering capability
2Ease of operation
If traditional steering components are included, then steering capability is provided, but vehicle weight increases
Solution Approach 1:
The patent removes heavy mechanical steering components (steering shaft, electric motor, steering gear) from the vehicle, directly reducing the weight of moving parts while maintaining steering capability through the in-wheel motor control system
Solution Approach 2:
The in-wheel motor serves dual purposes as both a propulsion motor and a steering actuator, eliminating the need for separate steering mechanism weight and reducing overall vehicle weight while preserving full steering capability
3Ease of operation
If traditional steering system is used, then steering function is achieved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates multiple expensive mechanical components (steering shaft, electric motor, steering gear) from the system, directly reducing the bill of materials and manufacturing costs while maintaining steering functionality through the in-wheel motor
4Ease of operation
If traditional steering components are installed, then steering capability is provided, but package assemblability deteriorates
Solution Approach 1:
The patent removes the physical steering components (steering shaft, electric motor, steering gear) that occupy valuable vehicle packaging space, thereby improving package assemblability and available volume for other vehicle components while maintaining steering capability
Data Source
AI summary
The present invention provides a steering system for an in-wheel motor vehicle capable of controlling driving torques and speeds of in-wheel motors mounted in left and right wheels to be different from each other at the time of curve driving of the vehicle to generate a steering angle of the wheel for the curve driving, and performing a steering angle control of sensing the generated steering angle and fixing the steering angle to a desired steering angle.