Systems and methods for intelligent vehicle evaporative emissions diagnostics

A method comprising:

• learning routes commonly traveled by an engine driven vehicle, including altitude changes and stop durations;
• storing fuel vapors from a fuel system supplying fuel to the engine in a vapor storage device positioned in an evaporative emissions system;
• and
• diagnosing the fuel system and evaporative emissions system for undesired evaporative emissions based on a learned altitude change in a first condition, and based on a learned stop duration in a second condition.

A method comprising:

• capturing and storing fuel vapors from a fuel system in a fuel vapor storage device positioned in an evaporative emissions system, the fuel system supplying fuel to an engine which propels a vehicle;
• learning a plurality of routes commonly traveled by the vehicle;
• learning stops along the plurality of routes where stop duration is greater than a predetermined stop duration;
• learning an amount of heat rejected by the engine at each of the stops where stop duration is greater than the predetermined stop duration;
• and
• in a first condition, including the learned amount of heat rejected by the engine below a heat rejection inference threshold for a particular stop, conducting a test for undesired evaporative emissions on the fuel system and evaporative emissions system by actively drawing a vacuum on the fuel system and evaporative emissions system;
• and
• in a second condition, including the learned amount of heat rejected by the engine greater than the heat rejection inference threshold for the particular stop, conducting a test for undesired evaporative emissions on the fuel system and evaporative emissions system without actively drawing vacuum on the fuel system and evaporative emissions system.