System and method for adjusting fuel injection parameters during transient events to reduce particulate emissions
A system according to the present disclosure includes a fuel control module and at least one of a desired air per cylinder (APC) module and a predicted manifold absolute pressure (MAP) module. The desired APC module determines a desired amount of airflow to each cylinder of an engine. The predicted MAP module predicts a pressure within an intake manifold of the engine at a future time. The fuel control module selectively adjusts a fuel injection parameter of the engine based on at least one of: a change in the desired air per cylinder from a first time to a second time; and a change in the predicted manifold pressure from the first time to the second time.
1. A system comprising:
at least one of:
a desired air per cylinder (APC) module that determines a desired amount of airflow to each cylinder of an engine; and
a predicted manifold absolute pressure (MAP) module that predicts a pressure within an intake manifold of the engine at a future time; and
a fuel control module that:
determines at least one of:
a change in the desired air per cylinder from a first time to a second time; and
a change in the predicted manifold pressure from the first time to the second time; and
selectively adjusts a fuel injection parameter of the engine based directly on at least one of:
the change in the desired air per cylinder from the first time to the second time; and
the change in the predicted manifold pressure from the first time to the second time.
2. The system of claim 1 wherein the fuel control module adjusts the fuel injection parameter further based on a measured engine speed at the first time and an actual air per cylinder at the first time.
3. The system of claim 2 further comprising an actual air per cylinder (APC) module that determines the actual air per cylinder based on a measured mass flow rate of air flowing to the intake manifold at the first time and a number of cylinders in the engine.
4. The system of claim 1 wherein the fuel control module adjusts the fuel injection parameter further based on a change in an average value of at least one of the desired air per cylinder and the predicted manifold pressure over a predetermined number of engine cycles.
5. The system of claim 1 wherein the fuel injection parameter includes at least one of a number of fuel injections for a combustion event, an amount of fuel injected for each fuel injection relative to a total amount of fuel injected for the combustion event, fuel injection timing, and fuel injection pressure.
6. The system of claim 5 wherein the fuel control module adjusts the fuel injection parameter when the at least one of the change the desired air per cylinder and the change in the predicted manifold pressure is greater than a threshold.
7. The system of claim 6 wherein, when the at least one of the change the desired air per cylinder and the change in the predicted manifold pressure is greater than the threshold, the fuel control module at least one of:
increases the number of fuel injections for each combustion event; and
retards the fuel injection timing.
8. The system of claim 6 wherein, when the at least one of the change in the desired air per cylinder and the change in the predicted manifold pressure is greater than the threshold, the fuel control module adjusts the fuel injection parameter from a first value to a second value and maintains the fuel injection parameter at the second value for a first period.
9. The system of claim 8 wherein, when the first period ends, the fuel control module adjusts the fuel injection parameter from the second value to the first value over a second period.
10. The system of claim 6 wherein, when an engine coolant temperature is greater than a first temperature, the fuel control module at least one of:
increases the threshold, and
decreases the amount by which the fuel injection parameter is adjusted based on the at least one of the change the desired air per cylinder and the change in the predicted manifold pressure.
11. A method comprising:
at least one of:
determining a desired amount of airflow to each cylinder of an engine; and
predicting a pressure within an intake manifold of the engine at a future time;
determining at least one of:
a change in the desired air per cylinder from a first time to a second time; and
a change in the predicted manifold pressure from the first time to the second time; and
selectively adjusting a fuel injection parameter of the engine based directly on at least one of:
the change in the desired air per cylinder from the first time to the second time; and
the change in the predicted manifold pressure from the first time to the second time.
12. The method of claim 11 further comprising adjusting the fuel injection parameter further based on a measured engine speed at the first time and an actual air per cylinder at the first time.
13. The method of claim 12 further comprising determining the actual air per cylinder based on a measured mass flow rate of air flowing to the intake manifold at the first time and a number of cylinders in the engine.
14. The method of claim 11 further comprising adjusting the fuel injection parameter further based on a change in an average value of at least one of the desired air per cylinder and the predicted manifold pressure over a predetermined number of engine cycles.
15. The method of claim 11 wherein the fuel injection parameter includes at least one of a number of fuel injections for a combustion event, an amount of fuel injected for each fuel injection relative to a total amount of fuel injected for the combustion event, fuel injection timing, and fuel injection pressure.
16. The method of claim 15 further comprising adjusting the fuel injection parameter when the at least one of the change the desired air per cylinder and the change in the predicted manifold pressure is greater than a threshold.
17. The method of claim 16 further comprising, when the at least one of the change the desired air per cylinder and the change in the predicted manifold pressure is greater than the threshold, at least one of:
increasing the number of fuel injections for each combustion event; and
retarding the fuel injection timing.
18. The method of claim 16 further comprising, when the at least one of the change in the desired air per cylinder and the change in the predicted manifold pressure is greater than the threshold, adjusting the fuel injection parameter from a first value to a second value and maintaining the fuel injection parameter at the second value for a first period.
19. The method of claim 18 further comprising, when the first period ends, adjusting the fuel injection parameter from the second value to the first value over a second period.
20. The method of claim 16 further comprising, when an engine coolant temperature is greater than a first temperature, at least one of:
increasing the threshold, and
decreasing the amount by which the fuel injection parameter is adjusted based on the at least one of the change the desired air per cylinder and the change in the predicted manifold pressure.
21. The system of claim 1 wherein the fuel control module:
determines the change in the desired air per cylinder from the first time to the second time; and
selectively adjusts the fuel injection parameter based on the change in the desired air per cylinder from the first time to the second time.
22. The system of claim 1 wherein the fuel control module selectively adjusts the fuel injection parameter based on the change in the predicted manifold pressure from the first time to the second time.
23. The method of claim 11 further comprising:
determining the change in the desired air per cylinder from the first time to the second time; and
selectively adjusting the fuel injection parameter based on the change in the desired air per cylinder from the first time to the second time.
24. The method of claim 11 further comprising selectively adjusting the fuel injection parameter based on the change in the predicted manifold pressure from the first time to the second time.