Engine Oil Viscosity Control via Dynamic Temperature Management
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Solution Overview
Problem
Current engine oil management systems rely solely on a thermostat to control engine oil viscosity, which is inefficient as it takes too long to raise oil temperature and may not achieve the necessary threshold, and only considers temperature, neglecting engine speed and load parameters.
Innovation Solution
A system that determines a target engine oil viscosity based on engine speed and load using an estimator, which controls the diversion of engine oil to either an oil cooler or an oil heater through a three-way valve or bypass valves to achieve the target temperature, ensuring optimal viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple thermostat system is used to control engine oil temperature, then the system structure is simple, but the engine oil temperature control precision is insufficient and response speed is slow
Solution Approach 1:
The patent applies dynamics by making the valve system adjustable and responsive to changing operating conditions. The estimator continuously monitors engine speed, load, and temperature to dynamically adjust the valve positions, allowing the system to adapt to varying viscosity requirements throughout engine operation rather than using a fixed thermostat setting.
Solution Approach 2:
The patent changes the control parameter from simple temperature-based thermostat control to a multi-parameter estimator that considers engine speed, load, and temperature to determine target viscosity. This allows the system to optimize oil viscosity across different operating conditions rather than maintaining a single temperature threshold.
2Ease of operation
If a simple thermostat system is used to control engine oil temperature, then the system is easy to operate, but the response speed for raising oil temperature is slow
Solution Approach 1:
The system performs preliminary action by using the estimator to predict the required oil viscosity based on current engine operating conditions (speed and load) before the viscosity becomes suboptimal. This allows proactive adjustment of oil temperature through valve control, preventing viscosity degradation rather than reacting to it after the fact.
Solution Approach 2:
The patent implements feedback by continuously monitoring engine speed, load, and oil temperature, then using this information in the estimator to adjust valve positions and oil flow paths. This closed-loop control ensures the oil viscosity remains optimized by constantly comparing actual conditions with target viscosity requirements and making real-time adjustments.
3Device complexity
If only engine oil temperature is considered for viscosity control, then the control system is simple, but the viscosity optimization is insufficient
Solution Approach 1:
The patent applies dynamics by making the valve system adjustable and responsive to changing operating conditions. The estimator continuously monitors engine speed, load, and temperature to dynamically adjust the valve positions, allowing the system to adapt to varying viscosity requirements throughout engine operation rather than using a fixed thermostat setting.
Solution Approach 2:
The patent changes the control parameter from simple temperature-based thermostat control to a multi-parameter estimator that considers engine speed, load, and temperature to determine target viscosity. This allows the system to optimize oil viscosity across different operating conditions rather than maintaining a single temperature threshold.
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 system allows for precise control of engine oil viscosity, improving engine performance by continuously adjusting oil temperature based on operational parameters, leading to enhanced fuel efficiency and operation stability.
Implementation Method 1
passing through the engine oil cooler
Implementation Method 2
diverting engine oil to one of either an oil cooler or an oil heater
Data Source
AI summary
A system and method for managing the characteristics of engine oil in a lubrication system for an internal combustion engine is disclosed. Generally speaking, the method includes the steps of determining a target viscosity for the engine oil based on engine speed and engine load, determining a working viscosity which may be directly measured or determined based on engine oil temperature and engine oil type, comparing the target viscosity to the working viscosity, deriving a target engine oil temperature, and directing engine oil to one of an oil cooler, an oil heater, or neither when and until the target engine oil temperature is achieved. The oil viscosity management system includes an engine lubrication system having a volume of engine oil, a cooler coupled to the lubrication system, a heating mechanism also coupled to the lubrication system, a valving system for directing flow of the oil and coupled to each of the lubrication system, the cooler and the heating mechanism, a signal generator for generating a signal based on operational parameters of the engine, and an estimator for controlling the valving system in response to the signal.