Hydraulic CVVT Oil Warning via Integrated Operating Value
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Solution Overview
Problem
Current vehicle systems for detecting insufficient engine oil, relying on oil pressure or level sensors, can lead to delayed recognition of low oil levels, increasing the risk of engine damage due to high costs and potential false shutdowns caused by oil flow to the strainer.
Innovation Solution
A method and device utilizing a hydraulic continuously variable valve timing (CVVT) system to monitor engine conditions, including RPM, speed changes, and steering wheel angle, to determine if engine oil is insufficient, and activate a warning lamp while reducing engine RPM to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an oil pressure sensor or oil level sensor is installed to detect insufficient engine oil, then the detection accuracy is improved, but the manufacturing cost increases
Solution Approach 1:
The hydraulic CVVT device uses its own operating parameters (target vs. actual operating values) to detect insufficient engine oil, eliminating the need for separate oil detection sensors. The system serves itself by monitoring its own performance degradation caused by oil insufficiency
Solution Approach 2:
The hydraulic CVVT device, originally designed for valve timing control, is made to perform an additional function of detecting insufficient engine oil by monitoring its operating parameters, thereby reducing the need for dedicated detection components
2Device complexity
If an oil pressure switch is used to warn of insufficient oil, then the device complexity is reduced, but the reliability of detection deteriorates due to false negatives when oil flows to the strainer
Solution Approach 1:
The system continuously monitors the actual operating value of the hydraulic CVVT device and compares it with the target operating value, using this feedback loop to detect deviations caused by oil insufficiency. This continuous feedback mechanism prevents false negatives by detecting the progressive degradation in CVVT performance
Solution Approach 2:
The system detects oil insufficiency by monitoring CVVT performance degradation before it leads to complete engine failure. By integrating the operating value difference over time and counting exceedances, the system provides early warning, allowing preventive action before catastrophic damage occurs
3Productivity
If the engine continues to operate with insufficient oil, then the productivity is maintained, but the engine durability decreases due to lack of lubrication
Solution Approach 1:
The system performs preliminary detection of oil insufficiency by monitoring CVVT operating parameters before the condition leads to severe engine damage. The integration and counting mechanism provides advance warning, enabling the driver to replenish oil before catastrophic failure occurs
Solution Approach 2:
The system takes preliminary anti-action by detecting the early stages of oil insufficiency through CVVT performance monitoring and providing warning signals. This prevents the progression to severe lubrication failure and engine damage by enabling timely intervention
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 allows for early detection and warning of insufficient engine oil, reducing the risk of engine damage by using existing engine sensors and controlling engine RPM, thereby ensuring safe vehicle operation.
Implementation Method 1
hydraulic continuously variable valve timing (CVVT) device
Data Source
AI summary
A method for warning of insufficient engine oil for a vehicle includes: determining, by a controller, whether conditions for determining that the vehicle has insufficient engine oil are satisfied, after an engine of the vehicle is started; determining, by the controller, whether an integrated value obtained by integrating a difference between a target operating value and an actual operating value of a hydraulic continuously variable valve timing (CVVT) device included in the engine within an operating time period of the hydraulic CVVT device is equal to or greater than a reference difference value, when the conditions for determining whether the vehicle has insufficient engine oil are satisfied; and determining, by the controller, that the vehicle has insufficient engine oil based on counting information on the number of times the integrated value, obtained by integrating the difference between the target operating value and the actual operating value, is equal to or greater than the reference difference value.