Propulsion system control with MPC

Patent metadata

Field	Value
Publication number	US-9963150-B2
Application number	US-201715426306-A
Country	US
Kind code	B2
Filing date	Feb 7, 2017
Priority date	Jun 16, 2016
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A propulsion system, control system, and method are provided for optimizing fuel economy, which use model predictive control systems to generate first and second predicted actual axle torques and first and second predicted actual fuel consumption rates based on first and second sets of possible command values, respectively. The sets of possible command values include commanded engine output torques and commanded transmission ratios. First and second costs are determined for the first and second sets of possible command values, respectively, based on a first predetermined weighting value, a second predetermined weighting value, the first and second predicted actual axle torques, respectively, the first and second predicted actual fuel consumption rates, respectively, an axle torque requested, an engine output torque requested, a transmission ratio requested, and a fuel consumption rate requested. One of the first and second sets of possible command values is selected and set based on the lower cost.

First claim

What is claimed is:

1. A method for controlling a propulsion system of a motor vehicle, the method comprising:
generating a first predicted actual axle torque and a first predicted actual fuel consumption rate based on a first set of possible command values, the first set of possible command values including a first commanded engine output torque and a first commanded transmission ratio;
generating a second predicted actual axle torque and a second predicted actual fuel consumption rate based on a second set of possible command values, the second set of possible command values including a second commanded engine output torque and a second commanded transmission ratio;
determining a first cost for the first set of possible command values based on a first predetermined weighting value, a second predetermined weighting value, the first predicted actual axle torque, the first predicted actual fuel consumption rate, an axle torque requested, an engine output torque requested, a transmission ratio requested, and a fuel consumption rate requested;
determining a second cost for the second set of possible command values based on the first predetermined weighting value, the second predetermined weighting value, the second predicted actual axle torque, the second predicted actual fuel consumption rate, the axle torque requested, the engine output torque requested, the transmission ratio requested, and the fuel consumption rate requested;
selecting one of the first and second sets of possible command values based on the lower of the first and second costs;
setting desired command values based on the possible command values of the selected one of the first and second sets; and
controlling a vehicle parameter based on at least one of the desired command values.

2. The method of claim 1 , further comprising determining the first and second costs with the following cost equation:

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Assignees

• Gm Global Tech Operations Llc

Inventors

• Livshiz Michael
• Whitney Christopher E
• Wong Kevin C
• Bernardini Daniele
• Bemporad Alberto

Classifications

• B60W2510/0619

  Air-fuel ratio · CPC title

• B60W10/06 Primary

  including control of combustion engines · CPC title

• B60W30/188 Primary

  Controlling power parameters of the driveline, e.g. determining the required power · CPC title

• B60W2520/10

  Longitudinal speed · CPC title

• B60W2710/0666

  Engine torque · CPC title