Blade Pitch Control to Prevent Slip During Digging
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Solution Overview
Problem
Existing work machines experience decreased efficiency due to slip occurrences during digging work, which are typically addressed by raising the blade, leading to reduced soil excavation.
Innovation Solution
Implementing a pitch actuator to cause the blade to perform a backward tilt motion when slip is detected, reducing resistance and preventing the blade from lifting, thereby maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blade is raised when slip occurs, then the work machine can escape from slip, but the amount of soil dug by the blade decreases
Solution Approach 1:
Instead of raising the blade in the vertical dimension to escape slip, the invention applies a backward tilt motion in the pitch dimension (forward-backward tilt about the pitch axis). This dimensional change allows the blade to reduce resistance and escape slip without lifting, thereby maintaining soil excavation effectiveness.
2Reliability
If the blade is raised to escape slip, then the work machine can escape from slip, but work efficiency in digging decreases
Solution Approach 1:
The invention transitions from vertical blade lifting to backward tilt motion in the pitch dimension. This allows the blade to escape slip through a different mechanical dimension while maintaining its engagement with the soil, thus preserving work efficiency.
Solution Approach 2:
The invention changes the operational parameter from blade height (vertical position) to blade pitch angle (tilt angle). By controlling the pitch angle to perform backward tilt motion, the system escapes slip while maintaining optimal blade-soil contact for efficient digging.
Data Source
AI summary
A work machine includes a vehicle body including a travel device, a blade supported so as to be rotatable about a pitch axis with respect to the vehicle body, a pitch actuator configured to cause the blade to perform a pitch motion about the pitch axis, and a controller. The determines whether a slip occurs on the travel device during work with the blade, and causes the blade to perform the pitch motion in a backward tilt direction upon determining that the slip occurs.