Engine speed control device and method
First Claim
1. A control device (10) for controlling the speed (ω
-
eng) of an engine (1), characterized by comprising;
tracer means (13) which receive a target engine speed (ω
targ) indicating the desired engine speed (ω
eng), and a maximum engine torque (Tmax), and supply a reference engine speed (ω
ref) indicating the behaviour of the engine speed (ω
eng) during a transient speed state towards said target engine speed (ω
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 (ω
eng) to follow said reference engine speed (ω
ref);
observer means (14) which receive a measured engine speed (ω
meas) indicating the engine speed (ω
eng), and a combustion torque (Tcmb) indicating the drive torque generated by fuel combustion in said engine (1), and supply an observed engine speed (ω
obs) representing an estimate of engine speed (ω
eng) made on the basis of a system model (18) and as a function of said combustion torque (Tcmb) and said measured engine speed (ω
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 (ω
obs) and said measured engine speed (ω
meas); and
controller means (15) which receive said open-loop torque (Tol), said reference engine speed (ω
ref), said observed engine speed (ω
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).
1 Assignment
0 Petitions
Accused Products
Abstract
There is described a control device for controlling the speed of an engine of a vehicle, and having a tracer block which receives a target engine speed indicating the desired engine speed, and a maximum engine torque, and supplies a reference engine speed indicating the behaviour of the engine speed during a transient speed state towards the target engine speed, and an open-loop torque indicating the drive torque which must be produced by the engine during the transient speed state for the engine speed to follow the reference engine speed; an observer block which receives a measured engine speed indicating the engine speed, and a combustion torque indicating the drive torque generated by fuel combustion, and supplies an observed engine speed representing an estimate of engine speed made on the basis of a system model and as a function of the combustion torque and the measured engine speed, and an observed resisting torque representing an estimate of the total resisting torque acting on the drive shaft of the engine and made as a function of the observed engine speed and the measured engine speed; and a controller block which receives the open-loop torque, the reference engine speed, the observed engine speed, and the observed resisting torque, and supplies the combustion torque; the controller block controlling the engine so that the drive torque generated by fuel combustion equals the combustion torque.
21 Citations
10 Claims
-
1. A control device (10) for controlling the speed (ω
-
eng) of an engine (1), characterized by comprising;
tracer means (13) which receive a target engine speed (ω
targ) indicating the desired engine speed (ω
eng), and a maximum engine torque (Tmax), and supply a reference engine speed (ω
ref) indicating the behaviour of the engine speed (ω
eng) during a transient speed state towards said target engine speed (ω
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 (ω
eng) to follow said reference engine speed (ω
ref);
observer means (14) which receive a measured engine speed (ω
meas) indicating the engine speed (ω
eng), and a combustion torque (Tcmb) indicating the drive torque generated by fuel combustion in said engine (1), and supply an observed engine speed (ω
obs) representing an estimate of engine speed (ω
eng) made on the basis of a system model (18) and as a function of said combustion torque (Tcmb) and said measured engine speed (ω
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 (ω
obs) and said measured engine speed (ω
meas); and
controller means (15) which receive said open-loop torque (Tol), said reference engine speed (ω
ref), said observed engine speed (ω
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).- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
eng) of an engine (1), characterized by comprising;
-
10. A method of controlling the speed (ω
-
eng) of an engine (1), characterized by comprising the steps of;
supplying a target engine speed (ω
targ) indicating the desired engine speed (ω
eng), and a maximum engine torque (Tmax);
generating a measured engine speed (ω
meas) indicating the engine speed (ω
eng), and a combustion torque (Tcmb) indicating the drive torque generated by fuel combustion in said engine (1);
generating a reference engine speed (ω
ref) indicating the behaviour of the engine speed (ω
eng) during a transient speed state towards said target engine speed (ω
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 (ω
eng) to follow said reference engine speed (ω
ref), as a function of said maximum engine torque (Tmax) and said target engine speed (ω
targ);
generating an observed engine speed (ω
obs) representing an estimate of engine speed (ω
eng) made on the basis of a system model (18) and as a function of said combustion torque (Tcmb) and said measured engine speed (ω
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 (ω
obs) and said measured engine speed (ω
meas);
generating said combustion torque (Tcmb) as a function of said open-loop torque (Tol), said reference engine speed (ω
ref), said observed engine speed (ω
obs), and said observed resisting torque (Robs); and
controlling said engine (1) so that the drive torque generated by fuel combustion equals said combustion torque (Tcmb).
-
eng) of an engine (1), characterized by comprising the steps of;
Specification