Cycle Counter for Wheeled Tractor Scraper Using Pressure Feedback
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Solution Overview
Problem
Existing automated cycle counting systems for wheeled tractor scrapers may erroneously record cycle counts when the ejector becomes stuck or blocked, leading to inaccurate tracking of completed cycles.
Innovation Solution
A cycle counter system that includes a pressure sensor to monitor the ejector's movement and only records a cycle completion if the operating pressure exceeds a threshold value during the full dump position movement, preventing false cycle counting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automated cycle counting is implemented using control lever position and transmission gear sensor, then manual counting errors are eliminated, but false cycle counts are recorded when ejector becomes stuck or blocked
Solution Approach 1:
The system uses feedback from the pressure sensor to monitor ejector operation status and verify actual dump completion. The pressure signal provides real-time feedback about ejector movement, allowing the control system to distinguish between commanded dump actions and actual completed dumps, thereby preventing false cycle counts when ejector becomes stuck
Solution Approach 2:
The pressure sensor acts as an intermediary element between the ejector actuator and the cycle counting system. It provides indirect measurement of ejector position and movement status through pressure signals, enabling the system to detect whether the ejector actually moved during a dump cycle without directly monitoring ejector position
2Device complexity
If cycle counting is based solely on control lever position and transmission gear, then system complexity is reduced, but measurement precision of cycle completion deteriorates
Solution Approach 1:
The pressure sensor serves as an intermediary that indirectly monitors ejector movement without requiring direct mechanical connection or complex position sensing mechanisms. By measuring hydraulic pressure changes in the ejector actuator circuit, the system obtains reliable cycle completion data while maintaining relatively simple system architecture
Solution Approach 2:
The invention replaces direct mechanical position sensing of the ejector with hydraulic pressure sensing. Instead of using complex mechanical linkages or optical encoders to track ejector position, the system uses pressure sensors to infer ejector movement status, simplifying the measurement system while improving reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures accurate and reliable cycle counting by differentiating between actual and incomplete dump cycles, reducing errors and intentional manipulation.
Implementation Method 1
a sensor configured to generate a pressure signal indicative of a position of the ejector
Data Source
AI summary
A cycle counter for a wheeled tractor scraper is disclosed. The cycle counter may have an ejector configured to push material from a bowl of the wheeled tractor scraper, a sensor configured to generate a pressure signal indicative of a position of the ejector, and a controller in communication with the sensor. The controller may be configured to determine movement of the ejector toward a full dump position based on the pressure signal, and to record completion of a cycle for the wheeled tractor scraper after the ejector has reached the full dump position only if a value of the pressure signal exceeded a threshold value during movement of the ejector toward the full dump position.