Vehicle Pressure Control System Decoupling Pump from Engine Speed
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Solution Overview
Problem
Vehicle-installed pumping systems controlled by pressure control systems face challenges in adjusting pumping pressure without altering engine speed, leading to inefficiencies and potential issues with maintaining target pressures during changing engine conditions.
Innovation Solution
A pressure control system that receives signals from the engine and liquid pump, using a processor to adjust the liquid pump's pressure by controlling the variable displacement hydraulic pump, allowing for independent regulation of pumping pressure without changing engine speed, and compensating for engine speed changes to maintain target pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the liquid pump's pressure is adjusted by changing engine speed, then the pumping pressure can be controlled, but the engine speed changes which reduces system efficiency and reliability
Solution Approach 1:
The system separates the control of engine speed and pump pressure into independent channels. The engine speed is maintained constant while a variable displacement hydraulic pump adjusts pump pressure independently through its own control mechanism, resolving the coupling between engine speed changes and pressure control
Solution Approach 2:
A variable displacement hydraulic pump is introduced as an intermediary device between the engine and the liquid pump. This hydraulic pump acts as a buffer that decouples the engine's rotational speed from the liquid pump's pressure output, allowing pressure adjustment without engine speed changes
2Loss of energy
If the engine speed is maintained constant, then system efficiency improves, but the ability to adjust pumping pressure becomes limited
Solution Approach 1:
The variable displacement hydraulic pump incorporates a dynamic displacement control mechanism that can adjust its pump volume per cycle based on demand. This allows the system to maintain constant engine speed while achieving variable liquid pump pressure through real-time adjustment of the hydraulic pump's displacement
Solution Approach 2:
The system changes the displacement parameter of the variable displacement hydraulic pump to achieve pressure control. By adjusting the pump's displacement rather than the engine speed, the system maintains energy efficiency while achieving the required pressure adaptability
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
Enables efficient and precise control of pumping pressure, ensuring consistent liquid output pressure despite changes in engine speed, thereby improving the reliability and efficiency of fluid delivery systems in vehicles.
Implementation Method 1
a variable displacement hydraulic pump configured to provide mechanical energy to a fixed displacement hydraulic motor
Implementation Method 2
the fixed displacement hydraulic motor providing mechanical energy to the liquid pump
Implementation Method 3
a liquid pump configured to pump liquid from a liquid intake system to an outlet
Data Source
AI summary
A vehicle includes an engine and a liquid pump configured to pump liquid from a liquid intake system to an outlet. The vehicle further includes a pressure control system operably coupled to the engine via a communication connection, the pressure control system receiving a first signal from the engine representing engine speed. The pressure control system is configured to cause the liquid pump to change pumping pressure without changing the engine speed, and wherein the pressure control system is configured to cause the liquid pump to change pumping pressure without changing the engine speed when the pressure control system makes a determination relating to the engine speed.