Automatic Transmission Shift Control for Uphill Construction Machinery
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Solution Overview
Problem
Existing construction machines with manual or semi-automatic transmissions face issues such as low fuel efficiency, frequent stopping, damage to components due to shift shocks and noises, and inconvenience in manual gear shifting, particularly in situations requiring frequent shifts or high noise levels.
Innovation Solution
An automatic transmission apparatus for construction machines that optimizes shift conditions by using sensors to calculate slope gradients and torque, preventing upshifts on steep slopes and reducing sensor requirements, thereby minimizing damage and simplifying the controller configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual transmission shifting is performed by stopping the wheel excavator, then the transmission can be shifted from low gear to high gear, but fuel efficiency decreases and worker convenience deteriorates due to frequent stopping
Solution Approach 1:
The patent replaces the mechanical stopping-based shifting system with an electronic control system that uses sensors to detect traveling speed and automatically controls the synchronizer to engage/disengage gear stages while the vehicle is moving, eliminating the need for mechanical stopping during gear changes
Solution Approach 2:
The transmission system performs self-shifting by using sensors to detect traveling speed and automatically controlling the synchronizer engagement based on detected speed conditions, without requiring operator intervention or vehicle stopping
2Productivity
If manual shifting is performed while driving, then fuel efficiency improves, but the synchronizer is damaged due to sensor damage
Solution Approach 1:
The patent incorporates sensors that continuously detect traveling speed and provide feedback to the control system, which then automatically adjusts synchronizer engagement timing based on the detected speed conditions, ensuring safe shifting without synchronizer damage
Solution Approach 2:
The control system acts as an intermediary between the sensor detection and synchronizer control, processing the traveling speed information and determining the appropriate timing for synchronizer engagement to prevent damage during shifting operations
3Productivity
If automatic transmission apparatus is installed to enable shifting during driving, then fuel efficiency improves and worker convenience improves, but shift shocks and noises are periodically generated
Solution Approach 1:
The patent changes the shifting parameters by detecting traveling speed and using this information to determine optimal synchronizer engagement timing, thereby reducing shift shocks and noises while maintaining the ability to shift during driving operations
Data Source
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AI summary
Disclosed are a construction machine equipped with an automatic transmission apparatus and a shift control method. In a construction machine including an automatic transmission apparatus including an engine, a hydraulic pump, a traveling motor, a transmission and a controller performing an automatic shift according to the present invention, the controller has an uphill function of preventing an upshift, and compares a current slope gradient with a preset criterion gradient to activate the uphill function when the current slope gradient is larger than the criterion gradient.