Patent ID: 6615797
Filing Date: 2003-09-09
Classification: F02D

Abstract:
A control device (10) for controlling the speed (&ohgr;eng) of an engine (1), characterized by comprising:tracer means (13) which receive a target engine speed (&ohgr;targ) indicating the desired engine speed (&ohgr;eng), and a maximum engine torque (Tmax), and supply a reference engine speed (&ohgr;ref) indicating the behaviour of the engine speed (&ohgr;eng) during a transient speed state towards said target engine speed (&ohgr;targ), and an open-loop torque (Tol) indicating the drive torque which must be produced by said engine (1) during said transient speed state for the engine speed (&ohgr;eng) to follow said reference engine speed (&ohgr;ref); observer means (14) which receive a measured engine speed (&ohgr;meas) indicating the engine speed (&ohgr;eng), and a combustion torque (Tcmb) indicating the drive torque generated by fuel combustion in said engine (1), and supply an observed engine speed (&ohgr;obs) representing an estimate of engine speed (&ohgr;eng) made on the basis of a system model (18) and as a function of said combustion torque (Tcmb) and said measured engine speed (&ohgr;meas), and an observed resisting torque (Robs) representing an estimate of the total resisting torque acting on the drive shaft (2) of said engine (1) and made as a function of said observed engine speed (&ohgr;obs) and said measured engine speed (&ohgr;meas); and controller means (15) which receive said open-loop torque (Tol), said reference engine speed (&ohgr;ref), said observed engine speed (&ohgr;obs), and said observed resisting torque (Robs), and supply said combustion torque (Tcmb); said controller means (15) controlling said engine (1) so that the drive torque generated by fuel combustion equals said combustion torque (Tcmb).