Method and apparatus for engine oil dilution analysis

A method for analyzing lubricant fuel dilution of a vehicle engine on a chassis dynamometer or test bench, the method comprising:

• providing a plurality of sensors associated with the vehicle engine and in fluid communication with a positive crankcase ventilation system of the vehicle engine, wherein the vehicle engine comprises the lubricant and a fuel;
• providing a controller in communication with the plurality of sensors;
• providing an automatic engine lubricant sampling apparatus in communication with the controller and in fluid communication with a lubrication system of the vehicle engine, the lubricant sampling apparatus comprising:
• a plurality of sample containers;
• an automatic engine lubricant sampling system comprising an engine oil spout actuator or engine oil pressure regulator;
• automatically transferring, from the lubrication system via the engine oil spout actuator or engine oil pressure regulator of the automatic engine lubricant sampling system in response to a first signal from the controller, a first sample of the lubricant into a first sample container—of the plurality of sample containers;
• automatically transferring, from the lubrication system via the engine oil spout actuator or engine oil pressure regulator of the automatic engine lubricant sampling system in response to a second signal from the controller, a second sample of the lubricant into a second sample container of the plurality of sample containers;
• with the controller:
• automatically receiving, from the plurality of sensors, first sensor readings over a first time period associated with the first signal and second sensor readings over a second time period associated with the second signal;
• receiving a first lubricant fuel dilution analysis of the first sample of the lubricant and a second lubricant fuel dilution analysis of the second sample of the lubricant;
• automatically computing a change in the lubricant fuel dilution between the first lubricant fuel dilution analysis and the second lubricant fuel dilution analysis;
• automatically classifying the first sensor readings and the second sensor readings and, based on the classification, divide the first time period or the second time period into a plurality of regions;
• automatically, based on the classification, assigning to each region a respective fraction of the change in the lubricant fuel dilution, such that the entire change in the lubricant fuel dilution is assigned to the plurality of regions;
• for each region, automatically identifying a respective at least one sensor reading most strongly correlated with the respective fraction of the change in the lubricant fuel dilution;
• and
• automatically generating a report comprising:
• the first lubricant fuel dilution analysis, the second lubricant fuel dilution analysis, the plurality of regions, the respective fractions of the change in the lubricant fuel dilution, and the respective at least one sensor readings,
• wherein the lubricant fuel dilution is dilution of the lubricant by the fuel of the vehicle engine.

A system for analyzing lubricant fuel dilution of a vehicle engine on a chassis dynamometer or test bench, the system comprising:

• the vehicle engine, comprising a lubricant and a fuel;
• a plurality of sensors associated with the vehicle engine and in fluid communication with a positive crankcase ventilation system of the vehicle engine;
• a controller in communication with the plurality of sensors;
• an automatic engine oil sampling apparatus in communication with the controller and in fluid communication with a lubrication system of the vehicle engine, the engine oil sampling apparatus comprising:
• a plurality of sample containers;
• an automatic engine lubricant sampling system comprising an engine oil spout actuator or engine oil pressure regulator and configured to, in response to a respective signal from the controller, automatically transfer lubricant from the lubrication system to a respective sample container of the plurality of sample containers using the engine oil spout actuator or engine oil pressure regulator,
• wherein the controller is configured to, for each time period of a plurality of time periods:
• automatically send the respective signal to the lubricant sampling system to transfer the respective sample of the lubricant to the respective sample container;
• automatically receive, from the plurality of sensors, respective sensor readings;
• receive a respective lubricant fuel dilution analysis of the respective sample of the lubricant;
• automatically compute a change in the lubricant fuel dilution between the respective lubricant fuel dilution analysis and a previous lubricant fuel dilution analysis;
• automatically classify the respective sensor readings and, based on the classification, divide the time period into a plurality of regions;
• based on the classification, automatically assign to each region a respective fraction of the change in the lubricant fuel dilution, such that the entire change in the lubricant fuel dilution is assigned to the plurality of regions;
• for each region, automatically identify a respective at least one sensor reading most strongly correlated with the respective fraction of the change in the lubricant fuel dilution;
• and
• automatically generate a report comprising:
• the change in the lubricant fuel dilution, the plurality of regions, the respective fractions of the change in the lubricant fuel dilution for each region, and the respective at least one sensor readings,
• wherein the lubricant fuel dilution is dilution of the lubricant by the fuel of the vehicle engine.