Engine Oil Auto-Ignition Temperature Assessment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for preventing pre-ignition in internal combustion engines, particularly at low speeds, are complex and costly, and existing solutions do not effectively address the risk of engine oil-induced pre-ignition during engine aging.
Innovation Solution
A method involving aging engine oil for predetermined times, evaluating its auto-ignition temperature at high pressure using differential scanning calorimetry, and comparing it to a predetermined temperature to assess its propensity for pre-ignition, while also estimating the safe driving distance before pre-ignition occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods (spark plug adjustment, air/fuel mixture optimization, combustion chamber cleaning) are used to prevent pre-ignition, then pre-ignition risk is reduced, but device complexity and implementation cost increase
Solution Approach 1:
The patent replaces complex mechanical and system-level solutions (spark plug adjustments, air/fuel mixture control systems, combustion chamber cleaning mechanisms) with a simple chemical parameter measurement approach. By measuring the auto-ignition temperature of engine oil and comparing it to a predetermined threshold, the system identifies pre-ignition risk without requiring complex mechanical modifications or control systems.
Solution Approach 2:
The invention changes the approach from modifying engine operating parameters (spark timing, air/fuel ratio) to measuring a specific property of the engine oil (auto-ignition temperature). This parameter-based diagnostic method simplifies the prevention strategy by focusing on a single measurable property of the lubricant that directly indicates pre-ignition susceptibility.
2Reliability
If exhaust gas recirculation is implemented to prevent pre-ignition, then combustion control is improved, but material supply to combustion chamber increases and cost rises
Solution Approach 1:
The patent extracts the pre-ignition prevention function from the exhaust gas recirculation system and transfers it to the engine oil formulation and monitoring. Instead of modifying the combustion environment through exhaust gas recirculation, the solution is embedded in the engine oil's chemical composition and its auto-ignition characteristics, eliminating the need for additional material supply to the combustion chamber.
3Ease of operation
If engine oil is used without aging consideration, then operational simplicity is maintained, but pre-ignition risk increases during engine aging
Solution Approach 1:
The patent applies preliminary action by establishing predetermined auto-ignition temperature thresholds for engine oil before it is used. The method allows users to measure the auto-ignition temperature of the engine oil and compare it against predetermined values that account for aging effects. This preliminary characterization enables long-term reliability without requiring continuous monitoring or complex aging management systems during operation.
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 method provides a simple, reliable, and effective way to classify engine oils based on their pre-ignition risk, enabling the development of oils that reduce the likelihood of low-speed pre-ignition and extending safe driving distances.
Implementation Method 1
dispositif de calorimétrie différentielle à haute pression
Implementation Method 2
évaluer une température d'auto-inflammation dudit huile moteur à haute pression
Data Source
Figure 1
Figure 2~3
AI summary
The present invention relates to a method for determining the propensity of an engine oil to generate pre-ignition of an internal combustion engine of a vehicle, in particular of a motor vehicle, said engine oil being designed to be introduced into said internal combustion engine of the vehicle, said method comprising: – a step (P1) of ageing said engine oil for a predetermined ageing period, – after said predetermined ageing period, a step (E11) of evaluating an auto-ignition temperature of the engine oil at high pressure, – a step (E12) of comparing said auto-ignition temperature of the engine oil to a predetermined temperature, and if the auto-ignition temperature of the engine oil is below the predetermined temperature this oil is said to have a propensity to generate pre-ignition.