Work Vehicle Speed Control via Hydraulic Pump Displacement
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Solution Overview
Problem
Existing speed control methods for work vehicles do not effectively manage the speed difference between left and right traveling devices to maintain straight movement, leading to deviations and inefficiencies.
Innovation Solution
A speed control method that receives a setting stage from an operation member, determines the target moving direction based on the speed difference between hydraulic motors, and adjusts control parameters to maintain the vehicle's straight movement by controlling the displacement volumes of hydraulic pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the displacement volumes of hydraulic pumps are adjusted to control vehicle speed, then the speed control precision is improved, but the system complexity increases
Solution Approach 1:
The patent changes the displacement volume parameter of the hydraulic pumps to control vehicle speed. By adjusting this physical parameter, the system achieves precise speed control without requiring complex electronic control mechanisms, thus improving precision while managing complexity
Solution Approach 2:
The patent replaces complex electronic speed control systems with a mechanical hydraulic control system. By using the displacement volume adjustment mechanism, it simplifies the overall system while maintaining or improving speed control precision through purely mechanical means
2Manufacturing precision
If the hydraulic motors are controlled to maintain straight movement, then the movement accuracy is improved, but the control parameter complexity increases
Solution Approach 1:
The patent employs feedback control by continuously monitoring the actual movement of the vehicle and comparing it with the target straight movement path. Based on this feedback, the system adjusts the hydraulic pump displacement volumes to correct deviations, ensuring accurate straight movement while managing control complexity through systematic feedback loops
Solution Approach 2:
The patent segments the control system into independent left and right hydraulic motor control channels. Each channel can be controlled separately through its own hydraulic pump, allowing precise control of the speed difference between left and right sides to maintain straight movement without requiring complex integrated control
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
The method ensures precise control of the work vehicle's speed and direction, reducing deviations and enhancing operational efficiency by maintaining constant displacement volumes of hydraulic motors regardless of speed stages.
Implementation Method 1
a first hydraulic pump configured to supply hydraulic fluid to the first hydraulic motor, a second hydraulic pump configured to supply the hydraulic fluid to the second hydraulic motor
Data Source
AI summary
A speed control method of a work vehicle includes receiving a setting stage set by a first operation member among a plurality of speed stages, obtaining a target moving direction of a work vehicle that is determined by a speed difference between a target rotation speed of a first hydraulic motor and a second hydraulic motor, determining an operating range of a first control parameter and an operating range of a second control parameter based on the setting stage when a second operation member is operated so that deviation amount between the target moving direction and the straight direction is within first range, and determining a boost stage among the plurality of speed stages that corresponds to target rotation speeds higher than the target rotation speeds of the setting stage when the second operation member is operated so that deviation amount is out of the first range.