Work Machine Hydraulic Pressure Control for Heat Balance
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Solution Overview
Problem
Existing work machines face inefficiencies in controlling hydraulic systems, particularly in managing pilot fluid pressures when temperatures exceed predetermined levels, leading to abnormal heat balances which can affect performance and efficiency.
Innovation Solution
A hydraulic system for work machines that includes a pilot pump, operation pump, temperature sensor, and pressure controller to adjust pilot fluid pressures based on temperature readings, using control maps to determine appropriate pressure settings to maintain optimal heat balance by reducing pilot fluid pressure when temperatures are high.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pilot fluid pressure is maintained at normal levels regardless of temperature, then hydraulic pump output and machine power are preserved, but abnormal heat balance occurs and machine efficiency deteriorates at high temperatures
Solution Approach 1:
The patent implements dynamic adjustment of pilot fluid pressure based on real-time temperature monitoring. The pressure controller modifies the pilot fluid pressure from the normal level (first pressure) to a reduced level (second pressure lower than the first) when high temperature is detected, creating a dynamically adaptive system that responds to changing thermal conditions to maintain optimal heat balance and efficiency
Solution Approach 2:
The patent changes the physical parameter of pilot fluid pressure in response to temperature conditions. By switching the pressure level from first pressure to second pressure (where second pressure < first pressure) based on temperature threshold detection, the system adjusts hydraulic system parameters to prevent abnormal heat accumulation and maintain machine efficiency at high temperatures
2Productivity
If pilot fluid pressure is reduced when high temperature is detected, then heat balance is improved and machine efficiency increases, but hydraulic pump output and available power are reduced
Solution Approach 1:
The patent employs a feedback control mechanism where the temperature sensor continuously monitors thermal conditions and provides input to the pressure controller. Based on this temperature feedback, the controller adjusts pilot fluid pressure to optimize heat balance, creating a closed-loop system that balances thermal management with power output requirements
Solution Approach 2:
The patent takes preliminary action by detecting high temperature conditions and proactively reducing pilot fluid pressure before abnormal heat balance can cause severe performance deterioration or damage. This preventive approach maintains machine efficiency by addressing thermal issues before they become critical problems
3Temperature
If temperature-based pressure control is implemented, then heat balance is optimized, but system complexity increases due to additional sensors and controllers
Solution Approach 1:
The patent integrates temperature monitoring and pressure control functions into a unified control system. The temperature sensor and pressure controller work together as a multi-functional thermal management system that not only monitors temperature but also actively regulates pilot fluid pressure to maintain optimal heat balance, reducing the need for separate dedicated cooling systems
Data Source
AI summary
A work machine includes an engine, a pilot pump to be driven by the engine to supply a pilot fluid, an operation pump to receive a first pilot fluid to change an output power in accordance with the first pilot fluid, a pilot fluid tube provided between the pilot pump and the operation pump, an operation valve connected to the pilot fluid tube to output the first pilot fluid, the first pilot fluid being a part of the pilot fluid supplied from the pilot fluid, a temperature sensor to measure a temperature of at least one of an operation fluid including the pilot fluid, a cooling water, an engine oil, and an outside air, and a pressure controller to control a first pilot pressure of the pilot fluid outputted from the operation valve when a temperature measured by the temperature sensor is equal to or higher than a first temperature.