Systems and methods for managing torque

Patent metadata

Field	Value
Publication number	US-10112613-B2
Application number	US-201615042465-A
Country	US
Kind code	B2
Filing date	Feb 12, 2016
Priority date	Feb 12, 2016
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A method of managing torque at a vehicle standstill includes outputting torque from a powertrain to satisfy a driver torque demand. The method also includes, in response to a nonzero torque demand resulting in vehicle standstill, applying a friction brake to maintain the vehicle standstill and substantially reducing output torque of the powertrain during friction brake application. The method further includes satisfying driver torque demand using the powertrain and releasing the friction brake in response to the driver torque demand deviating from the nonzero torque demand by more than a predetermined amount.

First claim

What is claimed is:

1. A method comprising:
outputting torque from a powertrain to satisfy a driver torque demand;
responsive to a nonzero torque demand resulting in vehicle standstill, applying a friction brake to maintain the vehicle standstill and reducing output torque of the powertrain during friction brake application;
maintaining application of the friction brake for a predetermined duration of time following a shift from a motive transmission gear to a non-motive transmission gear; and
responsive to the driver torque demand deviating from the nonzero torque demand by more than a predetermined amount, satisfying driver torque demand using the powertrain and releasing the friction brake.

2. The method of claim 1 wherein applying the friction brake occurs after a vehicle speed is zero for a predetermined duration of time.

3. The method of claim 1 wherein applying the friction brake produces a resistive torque that exceeds a standstill torque by a predetermined amount.

4. A vehicle comprising:
a powertrain configured to output torque to satisfy driver torque demand; and
a controller programmed to
responsive to a nonzero torque demand resulting in vehicle standstill, apply a friction brake to maintain the vehicle standstill and reduce output torque of the powertrain during friction brake application;
maintain application of the friction brake for a predetermined duration of time following a shift from a motive transmission gear to a non-motive transmission gear; and
responsive to the driver torque demand deviating from the nonzero torque demand by more than a predetermined amount, satisfying driver torque demand using the powertrain and releasing the friction brake.

5. The vehicle of claim 4 wherein the applying occurs after a vehicle speed is zero for a predetermined duration of time.

6. The vehicle of claim 4 wherein the applying produces a resistive torque that exceeds a standstill torque by a predetermined amount.

Assignees

• Ford Global Tech Llc

Inventors

• Hunt Ryan
• Butcher Jonathan Andrew
• Crombez Dale Scott
• Treharne William David
• Lienau Deborah Sue

Classifications

• B60W20/40

  Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers {(power-up or power-down of the driveline B60W30/192)} · CPC title

• B60K6/20

  the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs · CPC title

• B60W10/02

  including control of driveline clutches · CPC title

• B60W2710/083

  Torque · CPC title

• B60T2260/04

  Automatic transmission · CPC title