Travel Primary Side Pressure Control for Track Loaders
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Solution Overview
Problem
Conventional track loaders experience significant drops in engine speed and low hill-climbing speed due to inadequate control over travel primary side pressure, leading to engine stalling and inefficient operation, especially when handling excessive loads.
Innovation Solution
Incorporation of a pressure control valve and control unit to independently generate no-load and drop characteristic lines between travel primary side pressure and engine speed, allowing for precise control of travel primary side pressure to prevent engine stalling and enhance traveling speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bleed circuit is provided to drain pilot oil to prevent engine stalling, then engine stalling is prevented, but the travel primary side pressure decreases excessively causing low traveling speed
Solution Approach 1:
The invention changes the control parameters by introducing a pressure control valve that independently regulates travel primary side pressure, decoupling it from the pilot pump discharge pressure. This allows the system to maintain higher travel primary side pressure (improving traveling speed) while separately controlling pilot oil pressure to prevent engine stalling, thus resolving the contradiction between reliability and speed.
2Speed
If the travel primary side pressure is rapidly decreased to increase traveling speed, then hill-climbing speed increases, but the engine speed recovery becomes slow under heavy loads
Solution Approach 1:
The invention implements dynamic control by making the travel primary side pressure characteristic line variable based on engine load conditions. The control unit adjusts the pressure control valve to generate different characteristic lines: one optimized for speed (rapid pressure decrease) and another for recovery (slower pressure decrease), allowing the system to switch between these states dynamically based on operational requirements.
3Speed
If the travel primary side pressure is set high under no-load condition, then traveling speed increases, but engine stalling occurs when load is applied
Solution Approach 1:
The invention segments the pressure control into two independent systems: one for travel primary side pressure (controlled by pressure control valve) and another for pilot oil pressure (controlled by bleed circuit). This segmentation allows the travel primary side pressure to be maintained high for speed while the pilot oil pressure is separately regulated to prevent engine stalling under load, eliminating the need to compromise between these conflicting requirements.
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 solution enables increased traveling speed while preventing engine stalling, even under heavy loads, by rapidly decreasing travel primary side pressure and ensuring smooth engine speed recovery, thereby improving the overall performance of the track loader.
Implementation Method 1
a pressure control valve for controlling a travel primary side pressure that is a pressure of a primary side of the travel operation device
Data Source
AI summary
A pressure control valve for controlling a travel primary side pressure that is a pressure of a primary side of a travel operation device is controlled by a control unit, thus the travel primary side pressure is controlled, and thereby a traveling speed is intended to be increased, preventing an engine stall.