Traveling Lever Direction Detection via Pilot Pressure Ratios
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Solution Overview
Problem
Existing working machines lack the ability to easily and accurately judge the operational direction of the traveling operation member, which is crucial for controlling the machine's movement.
Innovation Solution
The working machine incorporates a system with left and right traveling pumps, pressure receiving portions, traveling fluid lines, and pressure detectors to detect pilot pressures, allowing a controller to judge the operational position and direction of the traveling operation member based on predefined ratios of these pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure detectors and fluid lines are added to detect pilot pressures for judging operational direction, then measurement precision of operational direction is improved, but device complexity increases
Solution Approach 1:
The patent reuses existing hydraulic components (traveling pumps, fluid lines, and pressure receiving portions) for dual purposes: their original function of driving the traveling motor and the additional function of detecting operational direction through pilot pressure. This eliminates the need for dedicated sensors while achieving accurate direction detection.
Solution Approach 2:
The hydraulic system serves itself by using its own internal pressure signals (pilot pressures from the traveling pumps) to provide directional information. The system's operational state directly generates the detection signals needed, without requiring external sensing infrastructure.
2Reliability
If multiple pressure detectors and fluid lines are installed to detect pilot pressures, then reliability of operational direction detection is improved, but manufacturing cost increases
Solution Approach 1:
Existing hydraulic components perform multiple functions including both actuation and sensing, eliminating the need for separate sensing infrastructure and reducing manufacturing complexity while maintaining detection reliability.
Solution Approach 2:
The patent uses the existing hydraulic pressure signals as a copy or representation of the operational state, allowing the system to infer directional information from pressure variations without direct mechanical or electrical sensing of the control lever position.
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
Enables easy and accurate determination of the operational direction of the traveling operation member, enhancing control over the machine's movement without the need for additional sensors like potentiometers.
Implementation Method 1
a first pressure detector configured to detect a first pilot pressure that is the pressure of operation fluid passed through the first traveling fluid line, a second pressure detector configured to detect a second pilot pressure that is the pressure of operation fluid passed through the second traveling fluid line, a third pressure detector configured to detect a third pilot pressure that is the pressure of operation fluid passed through the third traveling fluid line, and a fourth pressure detector configured to detect a fourth pilot pressure that is the pressure of operation fluid passed through the fourth traveling fluid line
Data Source
AI summary
A working machine includes a first pressure detector configured to detect a first pilot pressure that is a pressure of operation fluid passed through a first traveling fluid line, a second pressure detector configured to detect a second pilot pressure that is a pressure of operation fluid passed through a second traveling fluid line, a third pressure detector configured to detect a third pilot pressure that is a pressure of operation fluid passed through a third traveling fluid line, a fourth pressure detector configured to detect a fourth pilot pressure that is a pressure of operation fluid passed through a fourth traveling fluid line, and a controller configured or programed to judge in which of the left-front, right-front, left-rear and right-rear operation areas an operational position of the traveling operation member exists.