Hydraulic Pump Control Levels for Stable Working Vehicle Operation
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Solution Overview
Problem
Operators with insufficient skill in operating working vehicles face challenges in controlling operation speeds and maintaining straight-traveling stability, leading to unintended vehicle direction changes due to uneven load distribution or crawler wear.
Innovation Solution
An operation control system that sets multiple levels for operation speeds, allowing operators to select a level on a display unit, which limits the hydraulic pump's discharge based on the selected level, controlling the traveling and working equipment speeds, and stabilizing the vehicle's direction through proportional integral derivative (PID) control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the operation speed of the operation unit is increased to improve productivity, then the working efficiency is improved, but operators with insufficient skill cannot perform operations with margin and may lose control
Solution Approach 1:
The system dynamically adjusts the operation speed based on the selected level. The control device limits the operation speed of the operation unit according to the selected level, allowing the speed to be flexible and adaptable rather than fixed. This enables operators with insufficient skill to select lower levels for margin and safety, while skilled operators can select higher levels for productivity.
Solution Approach 2:
The system changes the speed parameter based on the selected level. By providing multiple levels (first level to nth level) with different speed limitations, the system allows operators to adjust the operation speed parameter according to their skill and the work requirements, resolving the contradiction between high speed and control stability.
2Reliability
If the operation speed is limited to improve operator safety and control margin, then operators with insufficient skill can perform operations safely, but the productivity and working efficiency are reduced
Solution Approach 1:
The system allows dynamic selection of speed limitation levels. Operators can choose the appropriate level based on their skill and the specific work requirements, making the speed limitation flexible rather than fixed. This resolves the contradiction by allowing full speed when needed for productivity while providing speed limitation when safety is the priority.
Solution Approach 2:
The operation speed range is segmented into multiple levels (first level to nth level), each with different speed limitations. This segmentation allows operators to select the appropriate speed level for their skill and work requirements, rather than having a single unified speed limit, thus resolving the contradiction between safety and productivity.
3Adaptability or versatility
If multiple speed levels are provided to accommodate different operator skills, then operators can select appropriate speeds, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The control device serves multiple functions: it receives level selection input, determines the selected level, limits the operation speed based on the selected level, and controls the hydraulic pump. By making the control device universal and multi-functional, the system avoids adding separate complex control mechanisms for each function, thus reducing overall device complexity while providing adaptability.
Solution Approach 2:
The system merges the level selection interface, speed determination logic, speed limitation function, and hydraulic pump control into a unified control system. By combining these functions rather than implementing them as separate independent systems, the overall device complexity is reduced while still providing the versatility of multiple speed levels.
4Stability of the object's composition
If the hydraulic pump control is made more precise to maintain straight traveling, then the vehicle direction stability is improved, but the control system complexity increases
Solution Approach 1:
The control device monitors the operation lever input and the selected level, then adjusts the hydraulic pump output accordingly to maintain straight traveling. By implementing feedback control that continuously monitors and adjusts the system state, the vehicle direction stability is improved without requiring overly complex control mechanisms.
Solution Approach 2:
The control system automatically adjusts the hydraulic pump control based on the selected level and operation lever input, providing self-service stabilization. The system itself performs the correction needed to maintain straight traveling without requiring additional complex external control mechanisms, thus improving stability while minimizing added complexity.
Data Source
AI summary
An operation control system includes a control device having a hydraulic pump control unit that controls a hydraulic pump based on a level that an operator selects from levels in n stages (n being an integer of 2 or more). The hydraulic pump control unit has operation distance/current value corresponding data where an operation distance of an operating lever and a current value are made to correspond to each other in a corresponding manner with each level in the levels in n stages. A current value that corresponds to an operation distance of the operating lever at a present point of time is acquired from the operation distance/current value corresponding data that corresponds to the level that the operator selects, and controls the discharge amount of a pressurized oil that the hydraulic pump discharges based on the acquired current value.