Engine Oil Pump Control for High-Temperature Cooling
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Solution Overview
Problem
Conventional engine oil supply apparatuses fail to effectively manage oil temperature rises during high-load and high-rotation operations, leading to potential galling of sliding sections due to oil deterioration, especially when using low-viscosity oils.
Innovation Solution
An engine oil supply apparatus with a controlled oil pump discharge, an integrated oil cooler, and a control system that adjusts oil pressure to exceed the required pressure during high oil temperatures, ensuring adequate oil flow through the cooler to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If low-viscosity oil is used to reduce sliding resistance and improve fuel efficiency, then fuel efficiency is improved, but oil temperature rises easily causing deterioration and galling
Solution Approach 1:
The control apparatus increases the oil discharge amount in advance when detecting high-load high-rotation operation conditions, before the oil temperature can rise to dangerous levels. This preventive action ensures adequate cooling capacity is available when most needed.
Solution Approach 2:
The system dynamically changes the oil discharge amount parameter based on engine operating conditions. During high-load high-rotation operations, the discharge amount is increased to enhance cooling, while under normal conditions the discharge amount is reduced to minimize pump load and improve fuel efficiency.
2Temperature
If oil discharge amount is increased to cool the oil during high-load high-rotation operation, then oil temperature is controlled, but drive load on the oil pump increases reducing fuel efficiency
Solution Approach 1:
The oil pump operates dynamically with variable displacement, allowing the discharge amount to be adjusted in real-time according to engine operating conditions. This dynamic adjustment enables the system to optimize the balance between cooling requirements and energy consumption.
Solution Approach 2:
The control apparatus uses feedback from engine operating condition sensors to continuously adjust the oil discharge amount. When high-load high-rotation conditions are detected, the system increases discharge for cooling; when conditions normalize, the discharge is reduced, creating a closed-loop control system that optimizes fuel efficiency.
3Device complexity
If conventional oil supply apparatus is used without temperature control, then device complexity is low, but oil deterioration and galling occur during extended high-load operation
Solution Approach 1:
The control apparatus performs multiple functions: it monitors engine operating conditions, determines cooling requirements, adjusts oil pump discharge amount, and prevents both overheating and excessive energy consumption. This multi-functionality is achieved within the existing control system framework without adding separate dedicated cooling control mechanisms.
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 configuration minimizes the drive load on the oil pump, improves fuel efficiency, and effectively suppresses oil temperature rises using existing cooling infrastructure, preventing oil deterioration and galling.
Implementation Method 1
an oil cooler which is provided on the oil supply path and which cools oil discharged from the oil pump
Data Source
AI summary
An engine oil supply apparatus includes: an oil pump; an oil supply path which supplies oil to a hydraulic operating section of an engine; an oil cooler which is provided on the oil supply path and which cools oil discharged from the oil pump; and a control apparatus which sets a required oil pressure required from the hydraulic operating section in accordance with an operation state of the engine, as a target oil pressure, and controls the discharge amount of the oil pump so that an oil pressure inside the oil supply path equals the target oil pressure. The control apparatus controls the oil pump so that, during an operation state of the engine where the oil enters a prescribed high oil temperature state, the oil is discharged in an amount exceeding a discharge amount corresponding to the required oil pressure of the hydraulic operating section.