Bulldozer GPS Receiver Mounting and Angle Calculation
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Solution Overview
Problem
Existing construction machines face challenges in accurately receiving GPS data due to vibrations and environmental exposure when the GPS receiver is mounted on the work implement, and increased processing load when it is mounted on the vehicle body, requiring protection and efficient calculation of the work implement's global position.
Innovation Solution
A construction machine design with a GPS receiver fixed to the vehicle body, using a lift frame, angling cylinder, and tilt cylinder, along with an angle obtaining part that stores a conversion table to simplify the calculation of blade angles and positions, thereby reducing vibration transfer and processing load, and protecting the GPS receiver from environmental hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the GPS receiver is disposed on the work implement, then the global position of the work implement can be obtained, but vibrations of the work implement directly transfer to the GPS receiver and inhibit accurate GPS data reception
Solution Approach 1:
The system separates the GPS receiver from the work implement, placing it on the vehicle body instead. This segmentation isolates the GPS receiver from vibrations generated by the work implement, allowing accurate GPS data reception while maintaining the ability to calculate the work implement's global position through coordinate transformation based on cylinder lengths and blade angles.
Solution Approach 2:
The patent introduces an intermediary calculation system that uses the GPS receiver's position data combined with blade angle data (obtained from cylinder length measurements) to compute the work implement's global position. This intermediary approach avoids direct mounting of the GPS receiver on the vibrating work implement while still achieving the measurement goal.
2Measurement precision
If the GPS receiver is disposed on the vehicle body, then vibrations are reduced and GPS data reception is improved, but the lengths of multiple cylinders must be considered in calculating the global position of the work implement, increasing system-related processing load
Solution Approach 1:
The system pre-calculates and stores conversion tables for cylinder lengths to blade angles before operation. During actual work, the control unit simply references these pre-computed tables rather than performing complex real-time geometric calculations, significantly reducing processing load while maintaining accuracy.
Solution Approach 2:
Instead of performing complex real-time geometric calculations, the system uses pre-computed conversion data (tables) that copy the results of complex calculations into a simpler lookup format. This allows the control unit to obtain blade angles from cylinder lengths through simple table reference rather than complex computation.
3Measurement precision
If the GPS receiver is disposed on the work implement, then the global position can be directly obtained, but the GPS receiver must be protected from earth and sand splashed by the work implement
Solution Approach 1:
The system separates the GPS receiver from the work implement by mounting it on the vehicle body. This segmentation physically protects the GPS receiver from environmental hazards (earth and sand) while maintaining the ability to determine work implement position through coordinate transformation using cylinder length and blade angle data.
Data Source
AI summary
A bulldozer of the present invention includes a GPS receiver which is fixed to a vehicle body of the bulldozer, and angle obtaining part which stores a conversion table in which a combination of an angling cylinder length and a tilt cylinder length are matched with a combination of a blade angling angle and a blade tilting angle.