Dual-Powerpack Steer-by-Wire Rack Positioning With Vernier Control
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Solution Overview
Problem
Mechanical steering systems in vehicles require a physical connection between the steering wheel and road wheels, which can be replaced or supplemented by steer-by-wire systems to eliminate mechanical linkage and provide advanced steering features, while maintaining the same functions and steering feel as conventional systems.
Innovation Solution
A steer-by-wire system comprising two powerpacks with different rotation ratios, a rotary-to-linear conversion mechanism, and a steering rack, utilizing motors and belts to convert rotational motion into linear motion, with a Vernier algorithm for precise control, and supports to prevent rotation and limit movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single motor is used in the powerpack, then the structure is simple, but the reliability is reduced
Solution Approach 1:
The powerpack is divided into two independent motor units (first motor and second motor) that can operate independently or together. This segmentation allows the system to maintain simplicity while improving reliability, as each motor can function as a backup for the other, ensuring continuous operation even if one motor fails.
2Adaptability or versatility
If mechanical linkage is eliminated in steer-by-wire systems, then advanced steering features are enabled, but the steering feel may be compromised
Solution Approach 1:
The steer-by-wire system incorporates feedback mechanisms that provide the driver with tactile information about road conditions and vehicle state, simulating the steering feel of mechanical systems. This allows the system to eliminate physical mechanical linkage while maintaining the sensory feedback necessary for natural steering operation.
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
The system achieves precise steering control and advanced features by eliminating mechanical connections, providing a compact and efficient steering apparatus that maintains steering feel and functionality.
Implementation Method 1
a first powerpack comprising a first motor; a second powerpack comprising a second motor; and a steering rack operably coupled to the first motor of the first powerpack and the second motor of the second powerpack, the steering rack configured to be linearly movable in response to rotation of at least one of the first motor and the second motor
Implementation Method 2
a rotary-to-linear conversion mechanism operably coupled to the first motor of the first powerpack and the second motor of the second powerpack and configured to convert a rotational motion generated from at least one of the first motor of the first powerpack and the second motor of the second powerpack into a linear motion for linearly moving the steering rack
Data Source
AI summary
A steer-by-wire system may comprise: a first powerpack comprising a first motor; a second powerpack comprising a second motor; a steering rack operably coupled to the first motor of the first powerpack and the second motor of the second powerpack, the steering rack configured to be linearly movable in response to rotation of at least one of the first motor and the second motor, wherein a rotation ratio associated with the first motor and a rotation ratio associated with the second motor are different from each other. The steer-by-wire system may identify a linear position of the steering rack based on the position of the first motor and the position of the second motor using a Vernier algorithm.