Hydraulic Pump Swashplate Control via Engine Speed Feedback
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Solution Overview
Problem
Existing hydraulic power systems in machines like compactors face pressure buildup issues, leading to undesired operation, as they do not effectively evaluate parameters such as engine speed to manage pressure, unlike the proposed solution.
Innovation Solution
An electronic control module (ECM) in the hydraulic power system adjusts the angle of the swashplate of a hydraulic pump based on engine speed, using sensor information to control a limiter valve, which modifies the pressure and flow rate of hydraulic fluid, thereby adjusting the propel speed of the compactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a relief valve is used to reduce pressure in the hydraulic power system, then pressure control is improved, but the system cannot evaluate other parameters such as engine speed to optimize operation
Solution Approach 1:
The ECM receives feedback from sensors monitoring engine speed and other system parameters, then adjusts the swashplate angle accordingly. This closed-loop feedback system enables the hydraulic pump to adapt pressure output based on real-time engine conditions, resolving the contradiction between pressure control and parameter evaluation capability
Solution Approach 2:
The system transitions from static pressure relief valves to dynamic swashplate angle control that continuously adjusts hydraulic pump displacement based on engine speed. This dynamic adjustment mechanism allows the system to optimize pressure output adaptively rather than relying on fixed relief pressure settings
2Power
If pressure is increased to provide more power to wheels and implement, then power output is improved, but the engine may stall due to excessive pressure buildup
Solution Approach 1:
The ECM proactively adjusts the swashplate angle based on predicted power demands and current engine conditions before pressure buildup occurs. By anticipating power requirements and pre-adjusting pump displacement, the system prevents excessive pressure that could cause engine stalling while still meeting power demands
Solution Approach 2:
The system changes the physical parameter of swashplate angle to control hydraulic pump displacement and pressure output. By varying this geometric parameter in response to engine speed feedback, the system optimizes the balance between power delivery and engine stability, preventing stalling conditions
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 allows for precise control of pressure in the hydraulic power system, preventing engine stalling and optimizing machine operation by adjusting the swashplate angle in response to engine speed, ensuring efficient and stable performance.
Implementation Method 1
a hydraulic pump with a swashplate (206)... causing an angle of the swashplate to adjust based on the speed of the engine... causes a propel speed of the compactor to change
Implementation Method 2
causing, by the ECM, an angle of a swashplate of a hydraulic pump of a hydraulic power system to adjust based on the speed of the engine
Data Source
AI summary
An electronic control module (ECM) may obtain sensor information concerning an engine and may determine, based on the sensor information, a speed of the engine. The ECM may cause a swashplate of a hydraulic pump to adjust based on the speed of the engine.