Engine Oil Quality Detection Using Oil Pressure Switch Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for determining engine oil quality in internal combustion engines face challenges in balancing lubricity and friction reduction without causing engine damage, particularly due to fuel ingress and viscosity changes, which can lead to foaming and degradation of oil quality.
Innovation Solution
A method and device that evaluate the switching times of an oil pressure switch after the engine start to determine engine oil quality, using a stored oil quality model and analyzing pressure gradients without requiring special oil quality sensors, allowing for both short-term and long-term quality assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the viscosity of the engine oil is lowered to reduce fuel consumption and CO2 emissions, then fuel economy improves, but the lubricity of the engine oil deteriorates
Solution Approach 1:
The patent applies preliminary action by determining the oil quality before engine damage can occur. The system continuously monitors oil quality parameters and predicts future oil condition, allowing preventive maintenance actions to be taken before the oil viscosity degradation leads to insufficient lubricity and engine damage.
Solution Approach 2:
The patent implements feedback by using the determined oil quality information to adjust maintenance schedules and alert the driver. The system provides continuous feedback about oil condition based on viscosity measurements and fuel dilution detection, enabling dynamic adjustment of oil change intervals rather than following fixed schedules.
2Force
If fuel enters into the engine oil to reduce friction, then friction decreases, but the lubricity of the engine oil deteriorates to such an extent that engine damage occurs
Solution Approach 1:
The patent converts the harmful effect of fuel dilution into a beneficial monitoring opportunity. By detecting changes in oil quality parameters caused by fuel ingress, the system uses these changes as indicators to predict viscosity degradation and schedule maintenance before engine damage occurs, turning a potentially harmful phenomenon into a useful diagnostic signal.
Solution Approach 2:
The patent introduces an intermediary monitoring system between the fuel-oil mixing process and the engine components. The quality determination device acts as an intermediary that detects early signs of fuel dilution and viscosity changes, providing warning before the direct contact between degraded oil and engine surfaces causes damage.
3Measurement precision
If oil level sensors and special oil quality sensors are used to ascertain the quality of the engine oil, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent applies universality by using existing engine components and sensors for multiple purposes. The system utilizes standard engine sensors (temperature, pressure, flow) to determine oil quality, making the existing sensor system multi-functional by adding oil quality assessment capability without requiring dedicated specialized sensors.
Solution Approach 2:
The patent implements self-service by using the engine's own operational parameters and existing sensor infrastructure to monitor oil quality. The system leverages data already being collected for engine control (temperature, pressure, flow rates) and repurposes it for oil quality determination, eliminating the need for external specialized monitoring equipment.
4Measurement precision
If an oil condition sensor device with ultrasound sensor, temperature sensor and oil fill level sensor is used, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent extracts only the essential measurement functions needed for oil quality determination from complex sensor systems. Instead of using ultrasound sensors, temperature sensors, and fill level sensors simultaneously, the system extracts and utilizes only the necessary parameters (viscosity indication through flow and temperature correlation) that can be obtained from simpler, existing sensors.
Solution Approach 2:
The patent replaces expensive, complex sensor systems with simpler, more economical sensing approaches. The system uses standard engine sensors that are already present in the vehicle rather than adding costly specialized oil quality sensors, reducing overall system cost and complexity while maintaining sufficient measurement capability.
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
Enables cost-effective determination of engine oil quality without special sensors, providing insights into fuel input and viscosity changes, enabling timely oil changes and preventing engine damage by monitoring oil quality dynamically.
Implementation Method 1
an oil pressure switch (2) which, after a starting operation of the internal combustion engine, transmits binary switching information to the engine controller (1) when a specified pressure threshold is exceeded
Data Source
AI summary
The disclosure provides a method and a device for determining the engine oil quality of an internal combustion engine. The engine oil quality is determined by evaluation of the switching times of an oil pressure switch of the internal combustion engine after a starting operation of the internal combustion engine.