Engine control system and methods

1 . A method of controlling a two-stroke internal combustion engine, the method comprising:

determining a base nominal exhaust gas temperature using a measured exhaust valve position;

determining a base barometric pressure correction to the base nominal exhaust gas temperature using a measured barometric pressure;

calculating a current exhaust gas temperature based on the base barometric pressure correction to the base nominal exhaust gas temperature;

determining an exhaust gas temperature differential by comparing the current exhaust gas temperature to the base nominal exhaust gas temperature; and

implementing a fuel correction using the exhaust gas temperature differential,

wherein the fuel correction controls a fuel injection amount in the two-stroke internal combustion engine.

2 . The method of claim 1 , wherein determining the base nominal exhaust gas temperature is based on a measured engine speed and/or a measured throttle valve angle.

3 . The method of claim 1 , wherein determining the base barometric pressure correction is based on a measured engine speed.

4 . The method of claim 1 , wherein the fuel correction is calculated based on the measured exhaust valve position and a measured engine speed.

5 . The method of claim 1 , further comprising:

initiating a baseline fuel correction for a break-in period, the break-in period including data collection of the measured exhaust valve position, a measured engine speed, a measured throttle valve angle, and/or a measured crankcase pressure,

wherein the break-in period terminates when measured engine hours exceed an engine hour criteria threshold.

6 . The method of claim 5 , further comprising:

determining a coolant system temperature; and

comparing the coolant system temperature to a coolant temperature criteria range.

7 . A method of controlling a two-stroke internal combustion engine, the method comprising:

determining a base nominal exhaust gas temperature using a measured exhaust valve position;

determining an exhaust gas temperature differential by comparing a current exhaust gas temperature to the base nominal exhaust gas temperature; and

implementing a fuel correction using the exhaust gas temperature differential,

wherein the fuel correction controls a fuel injection amount in the two-stroke internal combustion engine.

8 . The method of claim 7 , wherein determining the base nominal exhaust gas temperature is based on a measured engine speed and/or a measured throttle valve angle.

9 . The method of claim 8 , wherein the fuel correction is calculated based on the measured engine speed, the measured throttle valve angle, and the exhaust gas temperature differential.

10 . The method of claim 7 , further comprising:

determining a base barometric pressure correction to the base nominal exhaust gas temperature using a measured barometric pressure; and

correcting the base nominal exhaust gas temperature with the base barometric pressure correction to determine the current exhaust gas temperature.

11 . The method of claim 10 , wherein determining the base barometric pressure correction is based on a measured engine speed.

12 . The method of claim 7 , further comprising:

initiating a baseline fuel correction for a break-in period, the break-in period including data collection of the measured exhaust valve position, a measured engine speed, a measured throttle valve angle, and/or a measured crankcase pressure,

wherein the break-in period terminates when measured engine hours exceed an engine hour criteria threshold.

13 . The method of claim 12 , further comprising:

determining a coolant system temperature; and

comparing the coolant system temperature to a coolant temperature criteria range.

14 . A method of controlling a two-stroke internal combustion engine, the method comprising:

determining a base nominal exhaust gas temperature using a measured exhaust valve position;

determining an exhaust gas temperature differential by comparing a current exhaust gas temperature to the base nominal exhaust gas temperature; and

implementing an ignition correction using the exhaust gas temperature differential,

wherein the ignition correction controls an ignition angle in the two-stroke internal combustion engine.

15 . The method of claim 14 , wherein determining the base nominal exhaust gas temperature is based on a measured engine speed and/or a measured throttle valve angle.

16 . The method of claim 15 , wherein the ignition correction is calculated based on the measured engine speed, the measured throttle valve angle, and the exhaust gas temperature differential.

17 . The method of claim 14 , further comprising:

determining a base barometric pressure correction to the base nominal exhaust gas temperature using a measured barometric pressure; and

correcting the base nominal exhaust gas temperature with the base barometric pressure correction to determine the current exhaust gas temperature.

18 . The method of claim 17 , wherein determining the base barometric pressure correction is based on a measured engine speed.

19 . The method of claim 14 , further comprising:

initiating a baseline fuel correction for a break-in period, the break-in period including data collection of the measured exhaust valve position, a measured engine speed, a measured throttle valve angle, and/or a measured crankcase pressure,

wherein the break-in period terminates when measured engine hours exceed an engine hour criteria threshold.

20 . The method of claim 19 , further comprising:

determining a coolant system temperature; and

comparing the coolant system temperature to a coolant temperature criteria range.