Work Vehicle Blade Pitch Control via Position Switching
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Solution Overview
Problem
Manual adjustment of the pitch angle of a bulldozer blade can lead to decreased work efficiency due to incorrect operation timing or amount, resulting in suboptimal performance during excavation and transport tasks.
Innovation Solution
A control system for a work vehicle that automatically adjusts the pitch of the blade based on target displacement data and movement amounts, determining a switching point to optimize the blade's posture between excavation and transport modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual adjustment of blade pitch is used, then operator control flexibility is maintained, but work efficiency decreases due to erroneous operation timing or amount
Solution Approach 1:
The blade pitch control system performs self-adjustment based on automatically acquired position information and pre-stored target displacement data. The controller determines the blade's own pitch angle and position, compares it with target values, and automatically adjusts the pitch without operator intervention, eliminating human error while maintaining optimal control
Solution Approach 2:
The patent replaces manual mechanical operation with an automated control system that uses position detection devices (GPS, inertial sensors) and electronic controllers. The mechanical system of manual lever operation is substituted with an electronic control system that automatically calculates and adjusts blade pitch based on real-time position data and stored target displacement data
2Reliability
If automatic control of blade pitch is implemented, then operation accuracy is improved, but device complexity increases
Solution Approach 1:
The controller serves multiple functions: it acquires position information from various sources (GPS, inertial sensors), stores target displacement data, calculates current blade position and pitch angle, determines switching points for pitch changes, and controls hydraulic actuators. This multi-functionality consolidates what could be separate complex systems into a single integrated controller, reducing overall device complexity while maintaining high operation accuracy
Solution Approach 2:
The patent introduces a controller as an intermediary between the position detection devices and the blade pitch adjustment mechanism. This intermediary processes position data, compares it with target data, and generates appropriate control commands, simplifying the overall system architecture by centralizing control logic rather than requiring direct complex interactions between multiple components
Data Source
AI summary
A control system for a work vehicle, which includes a vehicle body and work equipment that is changeable in height and pitch with respect to the vehicle body, includes a controller. The controller determines a switching point by referring to target displacement data indicating a target displacement of the height of the work equipment according to a movement amount of the work vehicle from a work start position. The controller determines whether or not the work vehicle has reached the switching point based on the movement amount of the work vehicle from the work start position. The controller outputs a command to change the pitch of the work equipment upon determining that the work vehicle has reached the switching point.