Variable Displacement Engine Oil Pump Pressure Control
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Solution Overview
Problem
Existing engine oil pump systems face challenges in optimizing oil pressure to balance lubrication and fuel efficiency, as operating at high pressure increases fuel consumption while low pressure may lead to inadequate lubrication and device malfunction.
Innovation Solution
A method of adjusting the displacement of the engine oil pump based on the maximum value of minimum oil gallery pressures to ensure sufficient lubrication for engine oil consumers while minimizing fuel consumption, by setting the pump displacement to 220 kPa for proper operation of valve operators and 200 kPa for piston cooling jets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oil pump is operated at high pressure to ensure sufficient lubrication and operation of devices, then the reliability of lubrication and device operation is improved, but engine fuel consumption increases
Solution Approach 1:
The patent applies a variable displacement oil pump that dynamically adjusts its output displacement based on real-time engine operating conditions and oil pressure feedback. The controller modifies the pump's displacement to match actual oil demand, allowing the system to operate at lower pressures when sufficient lubrication is achieved, thereby reducing fuel consumption while maintaining reliability when needed.
Solution Approach 2:
The system changes the operating parameters of the oil pump by adjusting its displacement volume based on monitored engine conditions and oil pressure levels. This parameter adjustment allows the pump to deliver appropriate oil flow at optimized pressure levels, avoiding excessive pressure operation that would increase fuel consumption while ensuring minimum pressure requirements for reliable lubrication are met.
2Use of energy by moving object
If the oil pump is operated at low pressure to reduce fuel consumption, then engine fuel consumption decreases, but adequate lubrication and device operation cannot be ensured
Solution Approach 1:
The patent implements a feedback control system that continuously monitors engine operating conditions and oil pressure levels. Based on this feedback, the controller adjusts the variable displacement oil pump's output to maintain oil pressure within an optimal range. This ensures that the pump operates at the lowest necessary pressure to maintain adequate lubrication, thereby reducing fuel consumption without compromising reliability.
3Reliability
If the oil pump displacement is increased to meet the maximum pressure requirement of all oil consumers, then all devices can operate as desired, but fuel consumption increases for conditions where maximum pressure is not needed
Solution Approach 1:
The variable displacement oil pump dynamically adapts its output displacement based on actual engine operating conditions and oil pressure feedback. Instead of operating at fixed maximum displacement, the pump adjusts its displacement in real-time to match oil demand, enabling the system to maintain device operation reliability at variable pressure levels and minimize fuel consumption during conditions requiring lower pressure.
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 approach reduces engine fuel consumption, ensures adequate lubrication, and improves the reliability of the oil pump by matching output pressure with demand, allowing all engine oil consumers to operate effectively.
Implementation Method 1
a variable displacement oil pump may pump oil throughout the engine and oil pump output pressure may be increased via increasing a displacement of the oil pump
Implementation Method 2
an engine may include valve operators that may be selectively deactivated by supplying pressurized oil to the valve operators
Implementation Method 3
piston cooling jets that spray oil on engine pistons to cool the engine pistons
Data Source
AI summary
Systems and methods for operating an engine with an oil pump that supplies engine oil to various oil consumers in an engine are presented. In one example, a displacement of a variable displacement engine oil pump is adjusted to provide sufficient oil pressure throughout the engine, but low enough to conserve fuel.