Hydraulic Oil Heating Control for Load-Sensing Work Vehicles
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Solution Overview
Problem
In cold climates, vehicle hydraulic oil takes too long to warm up to operating temperature, and existing systems require manual operator input or external movement to heat the oil efficiently.
Innovation Solution
A fluid heating system with a control module and a digitally controlled solenoid valve that automatically switches between positions to direct pressurized fluid to a pressure return tank, generating heat without external movement or continuous operator input, using a variable displacement pump to maintain a discharge pressure differential and increase oil temperature quickly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If pressure-compensated load-sensing systems are used, then energy efficiency is improved, but hydraulic oil heating capability deteriorates
Solution Approach 1:
The system uses the pump's own discharge pressure to automatically control the heating process. When the return tank level is low, the pump's discharge pressure differential causes automatic filling without external control, and the system self-regulates between filling and heating modes through the level sensor feedback mechanism.
Solution Approach 2:
The system alternates between automatic filling mode and heating mode based on return tank liquid level. When the level is low, filling occurs; when sufficient, heating occurs. This periodic switching between modes allows the system to maintain energy efficiency while providing adequate heating capability.
2Temperature
If manual cycling of loader circuit is used, then hydraulic oil heating is achieved, but operator fatigue and time consumption increase
Solution Approach 1:
The system automatically controls the heating process through a level sensor that monitors the return tank liquid level and actuates the control valve accordingly. The pump's discharge pressure differential automatically fills the tank when low, eliminating the need for manual operator intervention while maintaining effective heating capability.
Solution Approach 2:
The level sensor provides feedback on the return tank liquid level to the control system. When the level drops below a threshold, the sensor triggers automatic filling by actuating the control valve. This closed-loop feedback mechanism replaces manual operation with automated control based on real-time system state.
3Ease of operation
If automatic heating system is implemented, then operator input is eliminated, but system complexity increases
Solution Approach 1:
The pump's inherent discharge pressure differential is utilized to automatically fill the return tank when liquid level is low, without requiring external control signals or complex control logic. This self-filling mechanism reduces control system complexity while maintaining automation.
Solution Approach 2:
The system uses simple periodic switching between filling and heating modes based on liquid level threshold detection. The level sensor triggers mode changes at predetermined thresholds, creating a simple on/off control strategy that avoids complex continuous control algorithms while achieving effective automation.
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
Rapidly warms hydraulic oil to operating temperature independently of operator input or external movement, reducing warming time and eliminating the need for manual cycling, while also addressing issues related to SCR systems and urea tank heating.
Implementation Method 1
permitting pressurized fluid from the pump flowing to a pressure return tank and resulting in heating of pressurized fluid of the fluid circuit
Data Source
AI summary
A fluid heating system for a work vehicle includes a pressurized fluid circuit having a pump for providing pressurized fluid to the fluid circuit. A control module for controlling a first control device is in fluid communication with the fluid circuit, the first control device operable between a first position and a second position. The first position of the first control device permits a load sense pressure to be applied through the first control device, thereby preventing pressurized fluid from the pump flowing to a pressure return tank for heating the pressurized fluid. The second position of the first control device prevents the load sense pressure from being applied through the first control device, thereby permitting pressurized fluid from the pump flowing to a pressure return tank and resulting in heating of pressurized fluid of the fluid circuit.