Method for restoration of the drive torque during a change of gear
AssigneeMagneti Marelli Powertrain S.p.A.
InventorsFabrizio Amisano, Gabriele Serra
Life of this patent
Estimating the term…
Abstract
Method for restoration of the drive torque during a change of gear, wherein the clutch is closed in order to adjust the angular speed of the drive shaft to match the angular speed of the primary shaft of the gearbox; when the angular speed of the drive shaft is close to the angular speed of the primary shaft of the gearbox, a reference profile is generated for the angular speed of the drive shaft, and the drive torque generated by the engine is controlled in order to make the angular speed of the drive shaft follow the reference profile, which has a final portion which is substantially tangent to the angular speed of the primary shaft of the gearbox.
Claims15
A method for restoration of drive torque during a change of gear, wherein a clutch is closed in order to adjust an angular speed (ωm) of a drive shaft to match an angular speed (ωl) of a primary shaft of a gearbox;
- the method comprising generating a reference profile (ωmrif) for said angular speed (ωm) of said drive shaft, and controlling an engine, in order to make said angular speed (ωm) of said drive shaft follow said reference profile (ωmrif);
- and
- wherein, in a predetermined position (x*), said clutch transmits constant torque (Tcl*) which is substantially equal to a drive torque (T*) supplied by said engine immediately before change of gear.
A method for restoration of drive torque during a change of gear, wherein a clutch is closed in order to adjust an angular speed (ωm) of a drive shaft to match an angular speed (ωl) of a primary shaft of a gearbox;
- the method comprising generating a reference profile (ωmrif) for said angular speed (ωm) of said drive shaft, and controlling an engine, in order to make said angular speed (ωm) of said drive shaft follow said reference profile (ωmrif);
- wherein said drive torque (Tm) generated by said engine is controlled, in order to make said angular speed (ωm) of said drive shaft follow said reference profile (ωmrif);
- wherein, in order to control said drive torque (Tm) generated by said engine, a torque reference value (Tmob) is generated, to be requested from said engine itself;
- and wherein said torque reference value (Tmob) comprises a first open-loop contribution (Tmobl), which is dependent on a torque (Tcl) transmitted by said clutch.
A method for restoration of drive torque during a change of gear, wherein a clutch is closed in order to adjust an angular speed (ωm) of a drive shaft to match an angular speed (ω1) of a primary shaft of a gearbox;
- the method comprising generating a reference profile (ωmrif) for said angular speed (ωm) of said drive shaft, and controlling an engine, in order to make said angular speed (ωm) of said drive shaft follow said reference profile (ωmrif);
- wherein a drive torque (Tm) generated by said engine is controlled, in order to make said angular speed (ωm) of said drive shaft follow said reference profile (ωmrif);
- wherein, in order to control said drive torque (Tm) generated by said engine, a torque reference value (Tmob) is generated, to be requested from said engine itself;
- and
- wherein said torque reference value (Tmob) comprises a second contribution (Tmob2) in a closed loop, which is dependent on a difference between said angular speed (ωm) of said drive shaft and said reference profile (ωmrif).
A method for restoration of the drive torque during a change of gear, wherein a clutch is closed in order to adjust an angular speed (ωm) of a drive shaft to match the angular speed (ω1) of a primary shaft of a gearbox;
- the method comprising generating a reference profile (ωmrif) for said angular speed (ωm) of said drive shaft, and controlling an engine, in order to make said angular speed (ωm) of said drive shaft follow said reference profile (ωmrif);
- wherein said clutch is adjusted to a predetermined position (x*), in order to transmit constant torque (Tcl*), and said clutch itself is kept in said predetermined position (x*) until synchronisation has taken place between said drive shaft and said primary shaft;
- and
- wherein a power supply to said engine is stopped, so as not to generate useful torque until said angular speed (ωm) of said drive shaft is close to said angular speed (ωl) of said primary shaft of said gearbox, and said engine is regulated in order to make the angular speed (ωm)of said drive shaft follow said reference profile (ωmrif), when said angular speed (ωm) of said drive shaft is close to said angular speed (ωi) of said primary shaft of said gearbox.
Dependencies are inferred from the claim text.