Traveling Pump Pilot Pressure Sensing for Direction Judgment
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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 devices, motors, pumps, pressure receiving portions, and pressure detectors connected via fluid lines, with a controller that analyzes pilot pressures to determine the operational direction of the traveling operation member based on predefined ratios and thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure detectors and fluid lines are added to detect operational direction, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The existing hydraulic pump system is made multi-functional by adding pressure detectors to its fluid lines. The same hydraulic system that powers the traveling devices also provides pressure signals for operational direction detection, eliminating the need for separate detection hardware and reducing overall system complexity.
Solution Approach 2:
Pilot pressure is used as an intermediary signal that carries information about the operational direction of the traveling operation member. The pressure detectors measure this intermediary pressure in the fluid lines, which indirectly reflects the operational state without requiring direct mechanical contact or complex sensors.
2Measurement precision
If multiple pressure detectors are installed to judge operational direction, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The hydraulic pump's existing fluid distribution system is utilized for dual purposes: power transmission to traveling devices and operational direction sensing. This multi-functionality reduces the need for additional dedicated sensing hardware, thereby lowering manufacturing costs while maintaining detection accuracy.
Solution Approach 2:
The hydraulic system serves itself by providing both actuation and sensing functions. The same fluid lines that deliver hydraulic power also carry pressure signals that indicate operational direction, allowing the system to self-diagnose its state without external sensing infrastructure.
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
This system allows for easy and accurate judgment of the operational direction of the traveling operation member, enhancing control over the machine's movement.
Implementation Method 1
a left traveling pump to supply operation fluid to the left traveling motor, the left traveling pump including a first pressure receiving portion and a second pressure receiving portion so that the operation fluid is used to apply a pressure to at least one of the first and second pressure receiving portions
Data Source
AI summary
A working machine includes 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, 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; and a controller configured or programmed to judge an operational direction of the traveling operation member based on either first comparison information including comparison between the first pilot pressure and the second pilot pressure acting on the left traveling pump or second comparison information including comparison between the third pilot pressure and the fourth pilot pressure acting on the right traveling pump.