Optimal control of air-fuel ratio for a single cylinder engine using dynamic programming
2022-01-0496
03/29/2022
- Event
- Content
- Automotive exhaust emission control is of extreme importance in the current environmental scenario. For a spark ignition (SI) based internal combustion engine (ICE), this is primarily achieved with the help of a three-way catalyst (TWC). Accurate control of air fuel ratio (AFR) within the stochiometric value is required for optimum performance of TWC. The control system aims at regulating the fuel injected into the engine such that AFR is maintained in allowed range. Dynamics of ICE and fuel injection are highly nonlinear, and key challenges in development of a controller algorithm are transient cylinder air mass flow, fuel mass wall wetting phenomenon and sensor dynamics. Typical approaches include implementation of linear controllers which suffer from deviation due to wide operating ranges of ICE. In this paper, an optimal control based non-linear control strategy is employed for the fuel quantity injected to minimize deviation of AFR from stoichiometric ratio for a mean value engine model (MVEM). The desired control sequence for this nonlinear optimization is achieved with the help of Dynamic programming. Simulation analysis investigated revealed effectiveness in noise rejection and self-correction on the SI engine system. The proposed controller in comparison with a PID controller showed better capability in maintaining AFR ratio.
- Citation
- RAVEENDRANATH Sr., A., Das, H., and dhinagar PhD, S., "Optimal control of air-fuel ratio for a single cylinder engine using dynamic programming," SAE Technical Paper 2022-01-0496, 2022, .