Off-line calibration of universal tracking air fuel ratio regulators
View Patent ↗A fuel control system of an engine includes a simulation module and a control module. The simulation module generates a simulated pre-catalyst exhaust gas oxygen (EGO) sensor signal based on a simulated oxygen concentration of an exhaust gas. The simulation module determines a simulated pre-catalyst equivalence ratio (EQR) for the exhaust gas based on the simulated pre-catalyst EGO sensor signal. The control module generates a desired pre-catalyst EGO sensor signal based on a desired oxygen concentration of the exhaust gas. The control module determines a desired pre-catalyst EQR based on the desired pre-catalyst EGO sensor signal. The control module determines a cost function based on the simulated pre-catalyst EQR and the desired pre-catalyst EQR. The fuel control system is calibrated based on the cost function.
1. A fuel control system of an engine, comprising:
a simulation module that generates a simulated pre-catalyst exhaust gas oxygen (EGO) sensor signal based on a simulated oxygen concentration of an exhaust gas and that determines a simulated pre-catalyst equivalence ratio (EQR) for the exhaust gas based on the simulated pre-catalyst EGO sensor signal; and
a control module that generates a desired pre-catalyst EGO sensor signal based on a desired oxygen concentration of the exhaust gas, that determines a desired pre-catalyst EQR based on the desired pre-catalyst EGO sensor signal, and that determines a cost function based on the simulated pre-catalyst EQR and the desired pre-catalyst EQR,
wherein the fuel control system is calibrated based on the cost function.
2. The simulation system of claim 1 wherein the simulation module determines the simulated pre-catalyst EQR based on a fuel disturbance of the fuel control system.
3. The simulation system of claim 2 wherein the fuel disturbance includes one of an impulse fuel disturbance, a step fuel disturbance, and a ramp fuel disturbance.
4. The simulation system of claim 1 wherein the simulation module determines the simulated pre-catalyst EQR based on the desired pre-catalyst EQR, a mass air flow (MAF), a manifold air pressure (MAP), and an engine revolutions per minute (RPM).
5. The simulation system of claim 4 wherein the control module determines the MAF, the MAP, and the engine RPM based on vehicle test data collected from a vehicle driven over a driving schedule.
6. The simulation system of claim 1 wherein the simulation module injects disturbances in revolutions per minute (RPM) and engine manifold air pressure (MAP) of an engine and determines the simulated pre-catalyst EQR based on the disturbances.
7. The simulation system of claim 1 wherein the simulation module determines a number of events to delay the simulated pre-catalyst EQR based on vehicle test data collected from a vehicle driven over a driving schedule and delays the simulated pre-catalyst EQR for the determined number of events.
8. The simulation system of claim 1 wherein the control module determines a penalty function based on the desired pre-catalyst EQR, and wherein the control module determines the cost function based on the penalty function.
9. The simulation system of claim 1 wherein the fuel control system is calibrated based on a genetic algorithm that minimizes the cost function.
10. A method for controlling fuel supply to an engine, comprising:
generating a simulated pre-catalyst exhaust gas oxygen (EGO) sensor signal based on a simulated oxygen concentration of an exhaust gas;
determining a simulated pre-catalyst equivalence ratio (EQR) for the exhaust gas based on the simulated pre-catalyst EGO sensor signal;
generating a desired pre-catalyst EGO sensor signal based on a desired oxygen concentration of the exhaust gas;
determining a desired pre-catalyst EQR for the exhaust gas based on the desired pre-catalyst EGO sensor signal;
determining a cost function based on the simulated pre-catalyst EQR and the desired pre-catalyst EQR; and
calibrating the fuel control system based on the cost function.
11. The method of claim 10 further comprising determining the simulated pre-catalyst EQR based on a fuel disturbance of the fuel control system.
12. The method of claim 11 further comprising generating the fuel disturbance based on one of an impulse fuel disturbance, a step fuel disturbance, and a ramp fuel disturbance.
13. The method of claim 10 further comprising determining the simulated pre-catalyst EQR based on the desired pre-catalyst EQR, a mass air flow (MAF), a manifold air pressure (MAP), and an engine revolutions per minute (RPM).
14. The method m of claim 13 further comprising determining the MAF, the MAP, and the engine RPM based on vehicle test data collected from a vehicle driven over a driving schedule.
15. The method of claim 10 further comprising:
injecting disturbances in revolutions per minute (RPM) and engine manifold air pressure (MAP) of an engine; and
determining the simulated pre-catalyst EQR based on the disturbances.
16. The method of claim 10 further comprising:
determining a number of events to delay the simulated pre-catalyst EQR based on vehicle test data collected from a vehicle driven over a driving schedule; and
delaying the simulated pre-catalyst EQR for the determined number of events.
17. The method of claim 10 further comprising:
determining a penalty function based on the desired pre-catalyst EQR; and
determining the cost function based on the penalty function.
18. The method of claim 10 further comprising calibrating the fuel control system based on a genetic algorithm that minimizes the cost function.