Systems and methods for lubricant dilution detection

A lubricant dilution detection system, comprising:

• a lubrication system comprising a pressure regulator valve that is closed in a low idle condition of an engine;
• a lubricant pressure sensor for sensing values indicative of lubricant pressure in the lubrication system;
• a lubricant temperature sensor for sensing values indicative of lubricant temperature in the lubrication system;
• and
• a controller configured to:
• detect the low idle condition;
• receive the sensed values indicative of lubricant pressure and lubricant temperature during the low idle condition;
• determine a lubricant pressure threshold based on the sensed value indicative of lubricant temperature;
• determine lubricant dilution based on the sensed value indicative of lubricant pressure and the determined lubricant pressure threshold during the low idle condition;
• and
• in accordance with a determination that there is lubricant dilution, output an indication of the lubricant dilution.

A method for detecting lubricant dilution for a lubrication system, comprising:

• detecting a low idle condition of an engine when an engine speed is substantially equal to a low idle engine speed threshold;
• receiving sensed values indicative of lubricant pressure over time during the low idle condition;
• receiving a sensed value indicative of lubricant temperature during the low idle condition;
• determining a lubricant pressure threshold based on the sensed value indicative of lubricant temperature, wherein the lubricant pressure threshold is a variable threshold including different threshold values for different values indicative of lubricant temperature;
• determining whether the sensed values indicative of lubricant pressure are less than the determined lubricant pressure threshold during the low idle condition for a predetermined amount of time;
• in accordance with a determination that the sensed values indicative of lubricant pressure are less than the determined lubricant pressure threshold for the predetermined amount of time, determining lubricant dilution;
• and
• in accordance with a determination that there is lubricant dilution, outputting an indication of the lubricant dilution.