Variable Displacement Oil Pump Control for Torque Load Reduction
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Solution Overview
Problem
Existing engine oil pump control systems fail to optimally manage oil pressure based on engine speed, temperature, and runtime, leading to inefficient displacement and torque load on the engine.
Innovation Solution
A control system that determines target output pressures for the engine oil pump based on engine speed, temperature, and runtime, using adjustment values and proportional/integral gain calculations to select and control the pump's displacement, ensuring optimal oil pressure and reduced torque load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine oil pump maintains high displacement to ensure adequate oil pressure, then oil pressure reliability is improved, but torque load on the engine increases
Solution Approach 1:
The patent implements dynamic displacement control of the variable displacement oil pump based on real-time engine operating conditions. The controller adjusts the pump's displacement volume according to engine speed, temperature, and runtime parameters, allowing the system to optimize between oil pressure maintenance and torque load reduction under different operating scenarios.
2Reliability
If the engine oil pump increases displacement to maintain oil pressure during high engine load, then oil pressure reliability is improved, but engine efficiency decreases
Solution Approach 1:
The patent changes the displacement parameter of the oil pump dynamically based on multiple input parameters including engine speed, temperature, and runtime. By adjusting the displacement volume as a variable parameter rather than maintaining a fixed high displacement, the system achieves optimal oil pressure while minimizing impact on engine efficiency during high load conditions.
3Device complexity
If the engine oil pump uses fixed displacement design, then device complexity is reduced, but adaptability to different engine conditions deteriorates
Solution Approach 1:
The patent transitions from a fixed displacement pump design to a variable displacement pump with dynamic control capability. The controller continuously monitors engine conditions and adjusts the pump's displacement in real-time, providing adaptability to varying operating conditions while maintaining manageable system complexity through integrated control.
4Productivity
If the engine oil pump operates at high speed continuously, then productivity is improved, but oil temperature increases leading to reduced lubrication efficiency
Solution Approach 1:
The patent adjusts the pump's displacement parameter based on oil temperature feedback and engine operating conditions. When oil temperature rises due to continuous high-speed operation, the controller modifies the displacement to reduce pumping speed and allow thermal management, thereby maintaining lubrication efficiency while preserving productivity under normal conditions.
Data Source
AI summary
A first target module determines a first target output pressure of an engine oil pump based on a speed of the engine oil pump and an oil temperature. A second target module, based on a runtime period of an engine, sets a second target output pressure of the engine oil pump to one of greater than and equal to the first target output pressure. A third target module, based on an engine load, sets a third target output pressure of the engine oil pump to one of greater than and equal to the first target output pressure. A selection module selects one of the second and third target output pressures, sets a selected target output pressure based on the selected one of the second and third target output pressures, and controls displacement of the engine oil pump based on the selected target output pressure.