Fuel analysis systems and methods

An exhaust gas aftertreatment system controller for a vehicle system having a conversion catalyst, an oxidation catalyst, and an indication device, the exhaust gas aftertreatment system controller being configured to:

• receive a conversion catalyst temperature associated with the conversion catalyst;
• compare the conversion catalyst temperature to a conversion catalyst temperature lower threshold;
• compare the conversion catalyst temperature to a conversion catalyst temperature upper threshold;
• compare the conversion catalyst temperature to a conversion catalyst temperature middle threshold;
• increase a first bucket counter in response to determining that the conversion catalyst temperature is less than the conversion catalyst temperature middle threshold and greater than the conversion catalyst temperature lower threshold;
• increase a second bucket counter in response to determining that the conversion catalyst temperature is less than the conversion catalyst temperature upper threshold and equal to or greater than the conversion catalyst temperature middle threshold;
• and
• communicate a first signal to the indication device based on at least a calculation using the first bucket counter and the second bucket counter.

A method implemented with an indication device, the method comprising:

• receiving an upstream NOx amount;
• receiving a downstream NOx amount;
• determining a conversion efficiency based on the upstream NOx amount and the downstream NOx amount;
• increase a first bucket total conversion efficiency by the conversion efficiency;
• increase a second bucket total conversion efficiency by the conversion efficiency;
• comparing a first bucket counter to a first bucket counter threshold;
• comparing a second bucket counter to a second bucket counter threshold in response to the first bucket counter not being less than the first bucket counter threshold;
• determining an average first bucket conversion efficiency in response to the second bucket counter not being less than the second bucket counter threshold;
• comparing the average first bucket conversion efficiency to a first bucket conversion efficiency threshold;
• determining an average second bucket conversion efficiency in response to the average first bucket conversion efficiency being greater than the first bucket conversion efficiency threshold;
• comparing the average second bucket conversion efficiency to a second bucket conversion efficiency threshold;
• causing the indication device to be in a static state in response to determining that the average second bucket conversion efficiency is greater than the second bucket conversion efficiency threshold.