Variable Displacement Oil Pump Pressure Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing variable displacement-type oil pumps face increased electric power consumption due to the need for continuous electrical control of hydraulic pressures, which negatively impacts fuel economy.
Innovation Solution
A variable displacement-type oil pump design that includes a pump configuration unit, a movable member, a forcing mechanism, control oil chambers, a drain mechanism, an electrical control mechanism, and a control valve, which allows for regulation of discharge pressure to multiple setting pressures by controlling oil supply and discharge based on electric signals, reducing the need for continuous electrical control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous electrical control is used to maintain discharge pressure at desired values, then pressure regulation accuracy is improved, but electric power consumption increases
Solution Approach 1:
The control valve operates periodically based on pressure sensor feedback rather than continuous electrical control. The electrical control mechanism only activates intermittently to adjust the control oil chamber pressure, allowing the system to maintain accurate pressure regulation while significantly reducing electric power consumption compared to continuous control
Solution Approach 2:
The control valve automatically adjusts the control oil chamber pressure based on feedback from the pressure sensor without requiring continuous electrical control signals. The system uses its own output pressure to control its own operation, enabling accurate pressure maintenance with minimal electrical energy input
2Stability of the object's composition
If electrical control mechanism continuously adjusts control oil chamber pressure, then discharge pressure stability is improved, but fuel economy deteriorates
Solution Approach 1:
The pressure sensor continuously monitors the discharge pressure and provides feedback to the control valve. This feedback mechanism maintains stable discharge pressure by making adjustments only when pressure deviations occur, eliminating the need for continuous electrical control and thereby improving fuel economy
Solution Approach 2:
The control system uses the discharge pressure itself as the control parameter, with the control valve automatically adjusting control oil chamber pressure based on pressure feedback. This self-regulating mechanism ensures pressure stability while minimizing electrical power consumption and improving fuel economy
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 design effectively suppresses the increase in electric power consumption associated with the electrical control mechanism, enhancing fuel economy by optimizing pressure regulation.
Implementation Method 1
a decrease side control oil chamber that exerts a force on the movable member in a direction in which the volume variation of each of the plurality of pump chambers is decreased by being supplied with the oil discharged from the outlet portion
Implementation Method 2
an electrical control mechanism that is able to regulate a discharge pressure, which is a hydraulic pressure of the oil discharged from the outlet portion, to a plurality of setting pressures by controlling supply and discharge of the oil discharged from the outlet portion to and from the specified one control oil chamber
Data Source
AI summary
Variable displacement-type oil pump has pump configuration unit driven by engine and discharging oil sucked from inlet portion from outlet portion by volumes of a plurality of pump chambers being varied; cam ring changing volume variation of each pump chamber by moving; coil spring forcing cam ring in direction in which volume variation of each pump chamber is increased; control oil chamber forcing cam ring in direction in which volume variation of each pump chamber is decreased; drain port draining oil from control oil chamber; control valve into which a downstream side oil discharged from outlet portion is introduced, and which adjusts internal pressure of control oil chamber by supplying oil into control oil chamber when hydraulic pressure of the introduced oil exceeds a predetermined setting working pressure. With this configuration, it is possible to suppress increase in electric power consumption associated with an electrical control mechanism.