US 11,332,138 B2 · Method of operating a powertrain system during coasting operation

Abstract

A method of operating a powertrain system during coasting operation, wherein the powertrain system includes a driveline component (e.g., a transmission, drive shaft, differential, axle or wheel) having an output torque profile. The method includes: (i) determining a desired output torque transition profile for the driveline component between a first transition point before an end of a first state, and a second transition point after a beginning of a second state; and (ii) in response to a braking torque request, generating a friction braking torque command to operate a friction braking system, and adjusting the friction braking torque command during a transitional state between the first and second transition points by an amount corresponding to a difference between a magnitude of the output torque profile and a magnitude of the desired output torque transition profile.

Claims18

Dependent claims

A method of operating a powertrain system during coasting operation, the powertrain system including a driveline having a driveline output torque profile, comprising:

determining a desired driveline output torque transition profile between a first transition point before an end of a first driveline state, and a second transition point after a beginning of a second driveline state;
and
in response to a braking torque request:
generating a friction braking torque command to operate a friction braking system;
and
adjusting the friction braking torque command during a transitional driveline state between the first and second transition points by an amount corresponding to a difference between a magnitude Tout of the driveline output torque profile and a magnitude Tdesired of the desired driveline output torque transition profile, wherein the adjusting comprises increasing the friction braking torque command when Tout is greater than Tdesired, and decreasing the friction braking torque command when Tout is less then Tdesired.

3 more elements

A method of operating a powertrain system during coasting operation, the powertrain system including a driveline component having a driveline component output torque profile, comprising:

determining a desired driveline component output torque transition profile between a first transition point before an end of a first driveline component state, and a second transition point after a beginning of a second driveline component state;
and
in response to a braking torque request:
generating a friction braking torque command to operate a brake-by-wire friction braking system;
and
adjusting the friction braking torque command at a plurality of time points during a transitional driveline component state between the first and second transition points by an amount at each of the plurality of time points corresponding to a respective difference between a respective instantaneous magnitude Ti-out of the driveline component output torque profile and a respective instantaneous magnitude Ti-desired of the desired driveline component output torque transition profile, wherein the friction braking torque command is increased by |Ti-out−Ti-desired| when Ti-out is greater than Ti-desired, and decreased by |Ti-out−Ti-desired| when Ti-out is less than Ti-desired.

3 more elements

Dependencies are inferred from the claim text.

Method of operating a powertrain system during coasting operation

Life of this patent

Method of operating a powertrain system during coasting operation

Life of this patent

Abstract

Claims18