Offset-Blade Floor Saw Yaw Control for Drift Compensation
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Solution Overview
Problem
Existing floor saws experience drifting due to the offset cutting blade, leading to imbalanced operation and increased strain on the operator, making concrete processing inefficient and difficult.
Innovation Solution
A floor saw with a control unit that dynamically adjusts wheel forces and positions to compensate for drifting, using sensors for yaw motion detection and a remote control for path guidance, optimizing cutting efficiency and reducing operator strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cutting blade is mounted offset to one side of the floor saw, then cuts can be made close to walls or obstacles, but the saw drifts towards the side where the blade is mounted
Solution Approach 1:
The patent applies counterweight by using the operator's body weight as a balancing force. The offset blade creates a moment that causes drifting, and the operator counteracts this by positioning their body to create an opposing moment, effectively using themselves as a dynamic counterweight system
Solution Approach 2:
The patent implements dynamic compensation through active steering control. Rather than a fixed geometric compensation, the system continuously adjusts the steering angle based on real-time drift detection, creating a dynamic control loop that adapts to varying cutting conditions and concrete properties
2Ease of operation
If fixed gear ratios are used to compensate for drift, then the drive can be biased to counter drift, but the compensation is seldom perfect and residual drift remains
Solution Approach 1:
The patent implements feedback control by continuously monitoring the actual cutting path and comparing it to the desired path. The steering compensation is dynamically adjusted based on this feedback, creating a closed-loop control system that eliminates residual drift by constantly correcting deviations
Solution Approach 2:
The patent changes the steering angle parameter dynamically during operation rather than using fixed gear ratios. The control system adjusts the steering parameter in real-time based on detected drift, allowing precise compensation that adapts to varying conditions unlike fixed mechanical solutions
3Manufacturing precision
If manual compensation by operator body weight is used, then residual drift can be compensated, but the operation becomes more difficult and places additional strain on the operator
Solution Approach 1:
The patent applies self-service by implementing automatic drift compensation through the control system. The machine independently detects its own drift and self-corrects by adjusting the steering, eliminating the need for the operator to manually compensate and reducing physical strain while maintaining precision
Solution Approach 2:
The patent replaces the mechanical compensation method (operator body weight) with a control system. Instead of relying on manual physical adjustment, the system uses sensors and automated control to detect and correct drift, substituting mechanical/operator-based compensation with an automated control mechanism
Data Source
Figure 1A~1B
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AI summary
A floor saw for sawing in a concrete surface segment (160), the floor saw comprising a circular cutting blade (110) arranged transversally offset from a centrum line (C), which centrum line (C) is aligned with a forward direction (F) of the floor saw, the floor saw further comprising at least two supporting wheels (120) arranged to support the floor saw on the concrete surface segment (160), out of which supporting wheels at least one is a drive wheel, a sensor arrangement (140) configured to determine a current yaw motion of the floor saw, and a control unit (130) configured to obtain a desired yaw motion setting, wherein the drive wheel is arranged on an opposite side of the centrum line (C) compared to the circular cutting blade (110) and arranged to generate a respective variable wheel force by a respective first electric machine controlled by the control unit (130), and wherein the control unit (130) is arranged to control the first electric machine to reduce a difference between the current yaw motion of the floor saw and the desired yaw motion setting.