Work Machine Hydraulic System Temperature Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hydraulic systems for work machines face challenges in efficiently managing hydraulic oil pressure and temperature, leading to reduced output and potential engine stall when loads are applied, particularly due to inadequate control over hydraulic oil pressure and temperature-related viscosity changes.
Innovation Solution
The hydraulic system incorporates a hydraulic pump, sensors, operation valves, and actuation valves controlled by a controller to manage hydraulic oil pressure and temperature, using a network of oil paths and check valves to regulate pressure and flow, ensuring optimal hydraulic oil distribution and preventing engine stall by adjusting the actuation valve's opening based on temperature and pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the hydraulic pump operates under high load conditions, then the hydraulic output pressure increases, but the hydraulic oil temperature rises and viscosity changes, leading to reduced system efficiency and potential engine stall
Solution Approach 1:
The system uses temperature sensors to detect hydraulic oil temperature and feeds this information back to the control device. Based on the detected temperature, the control device adjusts the actuation valve to regulate hydraulic oil flow, preventing excessive temperature rise while maintaining required pressure output.
Solution Approach 2:
The control device changes operational parameters (actuation valve opening degree) based on detected temperature conditions. When temperature exceeds predetermined thresholds, the valve opening is adjusted to modify hydraulic oil circulation, thereby controlling temperature while maintaining system pressure requirements.
2Stress or pressure
If the actuation valve is kept closed to maintain high pressure, then hydraulic output pressure is maintained, but hydraulic oil circulation is restricted causing temperature buildup
Solution Approach 1:
The actuation valve opening degree is dynamically adjusted based on real-time temperature detection. The control device continuously modifies the valve position to balance pressure maintenance and heat dissipation, transitioning from static closed position to a dynamically controlled opening that adapts to thermal conditions.
Solution Approach 2:
The system allows controlled circulation of hydraulic oil through the actuation valve to dissipate excess thermal energy. By opening the valve under high-temperature conditions, the system discards thermal energy through controlled fluid circulation and heat exchange, preventing energy buildup that would otherwise cause system failure.
3Device complexity
If the hydraulic system operates without temperature control, then the system structure remains simple, but the engine may stall due to inadequate pressure management under load
Solution Approach 1:
The actuation valve serves as an intermediary component between the hydraulic pump and the hydraulic instrument. It mediates the relationship between pressure maintenance and temperature control by selectively regulating oil flow, enabling reliable engine operation without requiring complex dedicated temperature control systems.
Solution Approach 2:
The actuation valve performs multiple functions: pressure regulation, temperature control, and engine stall prevention. By making this single component multi-functional, the system achieves reliable operation under varying loads without adding separate dedicated systems for each function, thus maintaining structural simplicity while improving reliability.
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 solution effectively manages hydraulic oil pressure and temperature, enhancing the work machine's performance by maintaining optimal hydraulic output and preventing engine stall, even under loaded conditions, through precise control of hydraulic oil flow and pressure.
Implementation Method 1
a hydraulic pump (P1) configured to discharge hydraulic oil
Implementation Method 2
The check valve (73) is provided in the discharge oil path (71). The hydraulic oil is configured to flow from the second oil path (45) to the first oil path (40) via the check valve (73). The hydraulic oil is prevented from flowing from the first oil path (40) to the second oil path (45) via the check valve (73).
Implementation Method 3
a first sensor (91) configured to detect temperature of hydraulic oil... The actuation valve controller (90) is to control the actuation valve (72) to be opened and closed according to the temperature of hydraulic oil detected by the first sensor (91)
Data Source
AI summary
A hydraulic system of a work machine includes a first oil path which is connected to a hydraulic pump and though which hydraulic oil is to flow from the hydraulic pump. An operation valve is connected to the first oil path. An operation lever is to control the operation valve to control pressure of the hydraulic oil in accordance with an operation of the operation member. A hydraulic instrument is to be actuated by the hydraulic oil output from the operation valve. A second oil path connects the operation valve and the hydraulic instrument. The hydraulic oil in the second oil path is discharged through a discharge oil path. An actuation valve is provided in the discharge oil path. An actuation valve controller is to control the actuation valve to be opened and closed according to a temperature of hydraulic oil detected by a first sensor.