Hydraulic Circuit Control for Power Distribution
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Solution Overview
Problem
Hydraulic circuits face challenges in efficiently managing power distribution between tool systems and drive systems, particularly when the total power demand exceeds the capacity of the engine system, leading to inefficiencies and potential overheating.
Innovation Solution
A hydraulic circuit comprising a primary pump, displacement actuator, charge pump, direction control valve, and pressure control valve, controlled by a controller that adjusts the displacement of the primary pump based on sensed engine parameters and operational modes, allowing for dynamic control of pilot fluid pressure and flow direction to optimize power distribution and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the total power demand exceeds the engine system capacity, then the hydraulic circuit cannot meet the power requirements of both tool systems and drive systems, but increasing engine capacity leads to higher fuel consumption and potential overheating
Solution Approach 1:
The patent implements dynamic control of the primary pump displacement based on real-time detection of engine parameters (temperature, load, speed) and operational modes. The controller continuously adjusts the pump displacement to match actual power demands, enabling the hydraulic circuit to adaptively allocate power between tool systems and drive systems. This dynamic adjustment allows the system to meet varying power requirements without oversizing the engine, thereby reducing fuel consumption while preventing overheating through optimized power distribution.
2Power
If the primary pump displacement is increased to meet higher power demand, then sufficient power can be supplied to both tool systems and drive systems, but the engine system may overheat and fuel consumption increases
Solution Approach 1:
The patent employs a feedback control mechanism where the controller continuously monitors engine parameters including temperature, load, and speed. Based on this real-time feedback, the controller dynamically adjusts the primary pump displacement to optimize power delivery. When engine temperature rises or load conditions change, the system automatically modulates pump displacement to maintain adequate power supply to tool and drive systems while preventing overheating. This closed-loop feedback control enables the hydraulic circuit to respond adaptively to thermal and load conditions, resolving the contradiction between power supply capacity and temperature control.
3Use of energy by moving object
If the primary pump displacement is dynamically adjusted based on engine parameters and operational modes, then efficient power management is achieved with reduced fuel consumption, but the control system complexity increases
Solution Approach 1:
The patent integrates multiple control functions into a single controller that simultaneously manages primary pump displacement adjustment, power distribution between tool and drive systems, and engine parameter monitoring. The controller responds to various operational modes (travel, work, transport) and engine conditions (temperature, load, speed) using a unified control strategy. This multi-functional approach consolidates what could be multiple separate control systems into one integrated unit, reducing overall system complexity while achieving efficient power management and fuel consumption optimization through dynamic displacement 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
This solution enables efficient power management, reducing fuel consumption and preventing overheating by dynamically adjusting the displacement and direction of the primary pump, ensuring sufficient power supply while minimizing energy waste and maintaining system stability.
Implementation Method 1
The charge pump is configured to generate a flow of a pilot fluid
Implementation Method 2
The pressure control valve is configured to control a pressure of the pilot fluid to affect a movement amount of the displacement actuator
Implementation Method 3
The direction control valve is configured to control the flow of the pilot fluid to the displacement actuator to affect a movement direction of the displacement actuator
Data Source
AI summary
A hydraulic circuit is provided. The hydraulic circuit includes a primary pump, a displacement actuator, a charge pump, a direction control valve, and a pressure control valve. The displacement actuator is associated with the primary pump. The charge pump is configured to generate a flow of a pilot fluid. The direction control valve is configured to control the flow of the pilot fluid to the displacement actuator to affect a movement direction of the displacement actuator. The pressure control valve is configured to control a pressure of the pilot fluid to affect a movement amount of the displacement actuator. Further, the hydraulic circuit includes a controller. The controller is configured to control the direction and the pressure control valves to adjust a displacement of the primary pump based at least on one of a sensed engine parameter or a mode of operation of the primary pump.