Independent Drive Wheel Control for Tight-Turning Mobility Vehicles
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Solution Overview
Problem
Personal mobility vehicles face challenges in navigating tight spaces due to limited turning radius and stability issues, particularly when entering or exiting turns, which can lead to understeering or oversteering.
Innovation Solution
A four-wheeled vehicle with a steering assembly that includes two steerable front wheels and independently driven wheels, utilizing a controller to manage wheel speeds and directions based on steering input and throttle signals to maintain stability and reduce turning radius.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a personal mobility vehicle uses traditional steering and drive mechanisms, then the structure is simple, but the turning radius is large and stability is poor when entering or exiting turns
Solution Approach 1:
The vehicle divides the drive function into two independent motor systems, each controlling one drive wheel. This segmentation allows independent control of left and right wheels, enabling differential drive capabilities that improve turning performance and stability without requiring complex mechanical steering linkages for the drive wheels.
Solution Approach 2:
The control system dynamically adjusts the speed and direction of each drive wheel based on real-time steering input. During turns, the system varies wheel speeds to maintain stability, preventing understeering and oversteering by continuously adapting the drive forces to the current steering angle and vehicle state.
2Speed
If the vehicle uses independently driven wheels with dynamic speed control, then the turning radius is reduced and stability is improved, but the control system complexity increases
Solution Approach 1:
The control system continuously monitors steering input and uses this feedback to dynamically adjust drive wheel speeds. The controller processes steering position data and modulates motor output accordingly, creating a closed-loop control system that achieves precise speed control while managing complexity through intelligent algorithms rather than mechanical complexity.
Solution Approach 2:
The patent replaces traditional mechanical differential mechanisms and complex steering-linkage-integrated drive systems with electronically controlled independent motor systems. This substitution uses software-based control logic to achieve functions that would otherwise require complex mechanical differentials and linkages, reducing mechanical complexity while enabling sophisticated speed and direction control.
3Ease of operation
If the vehicle uses a four-wheeled configuration with steerable front wheels and independently driven rear wheels, then the turning radius is reduced comparable to three-wheeled vehicles, but the device complexity increases
Solution Approach 1:
The vehicle segments the steering and drive functions into independent systems: steerable front wheels handled by a traditional steering assembly and independently driven rear wheels controlled by separate motor systems. This functional segmentation allows the vehicle to achieve tight turning radius through coordinated control without requiring a complex integrated mechanism that combines steering and drive functions.
Solution Approach 2:
The independent motor systems on the drive wheels serve multiple functions: they provide propulsion, enable steering assistance, and contribute to stability control. This multi-functionality allows the vehicle to achieve three-wheeled-like maneuverability with a four-wheeled configuration, as the same drive motors perform both driving and steering functions during turns, reducing the need for additional specialized components.
Data Source
AI summary
In some embodiments, a vehicle may include a frame having longitudinal axis. The vehicle may include a steering assembly having a steering input and at least one wheel. The steering assembly may be coupled to the frame and configured to steer the vehicle based on input from a steering input. The vehicle may include a first drive wheel and a second drive wheel. The vehicle may include a steering position sensor configured to detect steering input including a position of the steering input and at least one of i) a rate of change of position of steering input and ii) steering position time. The vehicle may include at least one controller configured to process a signal from the steering position sensor and, in response to the processed signal, drive the first drive wheel and the second drive wheel, the first drive wheel being driven independent of the second drive wheel.