Coordination of torque interventions in MPC-based powertrain control

Patent metadata

Field	Value
Publication number	US-10119481-B2
Application number	US-201715465647-A
Country	US
Kind code	B2
Filing date	Mar 22, 2017
Priority date	Mar 22, 2017
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

A propulsion system, control system, and method are provided for optimizing fuel economy, which use model predictive control systems to generate a plurality of sets of possible command values and determine a cost for each set of possible command values of based on a first predetermined weighting value, a second predetermined weighting value, a plurality of predicted values, and a plurality of requested values. The set of possible command values having the lowest cost is determined and defined as a set of selected command values. Arbitration is performed including at least one of the following: A) determining at least one requested value based on arbitrating between a driver requested value and an intervention requested value; and B) determining a desired command value by arbitrating between a selected command value of the set of selected command values and a command intervention value.

First claim

What is claimed is:

1. A method for controlling a propulsion system of a motor vehicle, the method comprising:
generating a plurality of sets of possible command values;
determining a cost for each set of possible command values of the plurality of sets of possible command values based on a first predetermined weighting value, a second predetermined weighting value, a plurality of predicted values, and a plurality of requested values;
determining which set of possible command values of the plurality of sets of possible command values has a lowest cost; and
selecting the set of possible command values that has the lowest cost to define a set of selected command values;
performing an arbitration step comprising at least one of the following arbitration procedures A and B:
A) determining at least one requested value of the plurality of requested values based on arbitrating between a driver requested value and an intervention requested value; and
B) determining a desired command value by arbitrating between a selected command value of the set of selected command values and a command intervention value; and
controlling a vehicle parameter based on the desired command value.

2. The method of claim 1 , wherein performing the arbitration step comprises performing both of the arbitrations procedures A and B.

3. The method of claim 2 , wherein:
the plurality of sets of possible command values includes a plurality of commanded engine output torque values;
the set of selected command values includes a selected engine output torque value; and
the command intervention value includes an engine torque intervention value.

4. The method of claim 3 , further comprising:
generating a plurality of predicted actual axle torque values and a plurality of predicted actual fuel consumption rate values based on the plurality of sets of possible command values, the plurality of sets of possible command values including a plurality of possible commanded transmission ratio values; and
determining the cost for each set of possible command values further based on a predicted actual axle torque value of the plurality of predicted axle torque values and a predicted actual fuel consumption rate value of the plurality of predicted actual fuel consumption rate values, the plurality of requested values including a driver axle torque requested, an engine output torque requested, a transmission ratio requested, and a fuel consumption rate requested.

5. The method of claim 4 , further comprising determining the plurality of predicted actual axle torque values and the plurality of predicted actual fuel consumption rate values with the following set of equations:

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Assignees

• Gm Global Tech Operations Llc

Inventors

• Livshiz Michael
• Pattipati Bharath
• Whitney Christopher E
• Bernardini Daniele
• Bemporad Alberto

Classifications

• F02D2041/1412

  using a predictive controller · CPC title

• F02D2250/26

  by applying a torque limit · CPC title

• F02D11/105 Primary

  characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque · CPC title

• F16H63/502

  for smoothing gear shifts · CPC title

• F02D2200/1004

  Estimation of the output torque · CPC title