Pilot Pressure Control via Spool Throttling Under Pump Pressure Drop
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Solution Overview
Problem
Existing hydraulic circuits struggle to maintain required pilot pressure without increasing the size and cost of the system by relying on large accumulators when the main pump pressure drops.
Innovation Solution
A pilot pressure control device that uses a controller to throttle the opening of a spool in the fluid pressure circuit when pump pressure drops, utilizing a pilot circuit to maintain pilot pressure without enlarging the accumulator, and includes pressure sensors to detect and adjust spool openings based on detected pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the size of the accumulator is increased to lengthen the holding time of the pilot pressure, then the holding time is improved, but the size and cost of the system increase
Solution Approach 1:
The controller monitors pump pressure in real-time and provides feedback control by throttling the spool opening when pressure drops below a threshold, creating a closed-loop system that maintains pressure without requiring a large accumulator
Solution Approach 2:
The patent replaces the purely mechanical pressure maintenance system (large accumulator) with a control system that uses electronic sensing and active spool control to dynamically maintain pressure
2Stress or pressure
If the opening of the spool is throttled to maintain pump pressure, then the pilot pressure is secured, but the actuator operation may be affected
Solution Approach 1:
The spool opening is made dynamically adjustable rather than fixed, allowing the controller to throttle the opening only when and where needed to maintain pressure, while keeping it fully open during normal operation for optimal actuator performance
Solution Approach 2:
The throttling action is applied locally at the spool opening in the pilot circuit, rather than affecting the entire hydraulic system, allowing pressure maintenance in the pilot circuit without significantly impacting main actuator operation
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
Maintains pump pressure and secures pilot pressure at a lower cost without enlarging the accumulator, preventing frequent spool throttling and ensuring smooth actuator operation, thus achieving accurate pressure control.
Implementation Method 1
a controller configured, when a pump pressure drops to a predetermined pressure or below resulting from the drive of the fluid pressure actuator, to control so as to throttle an opening of a spool that causes the decrease in the pump pressure
Implementation Method 2
a pressure sensor configured to detect a fluid pressure of the fluid pressure actuator
Data Source
AI summary
To provide a pilot pressure control device capable of securing a pilot pressure with an inexpensive configuration. There is equipped with a controller configured, when a pump pressure drops to a predetermined pressure or below resulting from the drive of a fluid pressure actuator, to control so as to throttle an opening of a spool that is the cause of the drop in the pump pressure. The pump pressure can be maintained with an inexpensive configuration without increasing the size of an accumulator for pressure accumulation, and the pilot pressure can be secured by the pilot circuit from this pump pressure.