Kalman Filtering for Real-Time Individual Cylinder Air Fuel Ratio Observer on a Diesel Engine Test Bench

Jonathan Chauvin (1) , Philippe Moulin (2) , Gilles Corde (2) , Nicolas Petit (1) , Pierre Rouchon (1)

1 CAS - Centre Automatique et Systèmes
2 IFPEN - IFP Energies nouvelles

We propose an estimator of the individual cylinder air fuel ratios in a turbocharged Diesel Engine using as only sensor the single air fuel ratio sensor placed downstream the turbine. The observer consists of a time-varying Kalman Filter based on a physics-based model for the engine dynamics. We prove that the reference system converges toward a limit cycle. This limit cycle is used for the design of an extended Kalman filter. Performance is evaluated through test bench experiments on a 4 cylinder Diesel engine. The proposed approach has the advantage over existing methods of providing insight into the cylinders unbalance by considering a higher frequency model of the exhaust manifold. This information could pave the road to efficient closed loop control strategy as demonstrated on an experimental example.

Domaines: Automatique / Robotique

Jonathan Chauvin, Philippe Moulin, Gilles Corde, Nicolas Petit, Pierre Rouchon. Kalman Filtering for Real-Time Individual Cylinder Air Fuel Ratio Observer on a Diesel Engine Test Bench. 2006 American Control Conference, Jun 2006, Minneapolis, United States. pp.1886-1891. ⟨hal-00473240⟩