Engine Oil Supply Control Device Viscosity Adaptation
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Solution Overview
Problem
Existing oil supply control devices face challenges in maintaining target hydraulic pressure without excessive delay when viscosity characteristics of oil change due to oil type changes, affecting the operation of hydraulic actuating devices.
Innovation Solution
An oil supply control device with a variable oil pump, hydraulic pressure sensor, viscosity characteristics detector, and adjusting mechanism that uses master data to adjust oil discharge and maintain target hydraulic pressure, switching between different control values to ensure the hydraulic pressure meets the target even with changing viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge amount of the capacity variable oil pump is controlled to a target hydraulic pressure using a regulator valve, then the target hydraulic pressure can be attained even when oil is changed to oil of another type having different viscosity characteristics, but the viscosity resistance of oil affects the operation speed of hydraulic actuating devices causing excessive delay
Solution Approach 1:
The patent applies dynamics by making the oil pump discharge amount variable and adjustable in real-time. The capacity variable oil pump can dynamically change its discharge amount based on detected viscosity characteristics, allowing the system to adapt to different oil types and maintain both target pressure accuracy and fast operation speed without being constrained by fixed pump characteristics
Solution Approach 2:
The patent changes the parameter of oil discharge amount based on viscosity characteristics. By detecting viscosity and adjusting the pump discharge amount accordingly, the system compensates for viscosity resistance effects, enabling fast operation of hydraulic actuating devices while maintaining accurate hydraulic pressure control across different oil types
2Device complexity
If only a learning value of viscosity characteristics is updated, then storage is simplified, but it is difficult to appropriately control a hydraulically operated variable valve timing mechanism when oil is changed to oil of another type having different viscosity characteristics
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple master data sets corresponding to different viscosity characteristics in the storage unit. When oil is changed, the system can quickly switch to the appropriate pre-prepared control data without complex real-time calculations, ensuring accurate control of the variable valve timing mechanism while maintaining system simplicity
Solution Approach 2:
The patent changes control parameters by selecting different master data sets based on detected viscosity characteristics. Each master data set contains optimized control values for specific viscosity ranges, allowing the system to adapt to different oil types and maintain accurate valve timing control without increasing device complexity
Data Source
AI summary
An oil supply control device includes: a memory which stores first master data constituted by predetermined control value; a hydraulic controller which outputs the control value to an adjusting device to cause a hydraulic pressure to coincide with a target hydraulic pressure; and a determination portion which determines whether or not a first difference between an output control value and the control value of the first master data lies within a predetermined allowable range, wherein the hydraulic controller starts to control the adjusting device with use of the control value of the first master data, when the first difference lies within the allowable range, and starts to control the adjusting device with use of the control value of second master data, when the first difference does not lie within the allowable range, the control value of the second master data causing the first difference to lie within the allowable range.