Hybrid control of the air-fuel ratio in force transients for multi-point injection engines

The problem of delivering as quickly as possible a requested torque produced by a spark ignition engine equipped with a multi-point port injection manifold and with drive-by-wire electronics is addressed. The optimal control problem, subject to the constraint that the air-fuel ratio stays as close as possible to the stoichiometric ratio, is solved using a detailed, cycle-accurate hybrid model and hybrid control approaches. The quality of the control law, that is particularly simple to implement, has been analytically demonstrated and a set of simulations have been carried out