Hybrid controls architecture

Patent metadata

Field	Value
Publication number	US-9718454-B2
Application number	US-201314086084-A
Country	US
Kind code	B2
Filing date	Nov 21, 2013
Priority date	Nov 21, 2013
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

Apparatuses, methods and systems for hybrid powertrain control are disclosed. Certain example embodiments control an internal combustion engine and a motor/generator of a hybrid electric powertrain. Example controls may determine a total output demanded of a powertrain based at least in part upon an operator input, a battery output target based upon a battery state of charge and independent of the operator input, and an engine output target based upon the total output demanded and the battery output target. Such example controls may further determine a constrained engine output target, a modified battery output target based upon the total output demanded and the constrained engine output target, and a constrained battery output target based upon the modified battery output target and a battery constraint. Further embodiments, forms, objects, features, advantages, aspects, and benefits shall become apparent from the following description and figures.

First claim

What is claimed is:

1. A method of controlling a hybrid electric vehicle powertrain, the method comprising:
iteratively determining an engine output target and a battery output target with one or more electronic controllers the act of iteratively determining comprising operating the one or more controllers to determine:
a total output demanded of the powertrain based at least in part upon an operator input,
a first battery output target based upon a battery state of charge, independent of the operator input,
a first engine output target based upon the total output demanded and the first battery output target,
a second engine output target based upon the first engine output target and an engine constraint,
a second battery output target based upon the total output demanded and the second engine output target, and
a third battery output target based upon the second battery output target and a battery or motor/generator constraint; and

operating the one or more electronic controllers to control an internal combustion engine using an engine control command constrained by the iterative determination of the first engine output target and the second engine output target and to control a motor/generator of the powertrain using a motor/generator command constrained by the iterative determination of the first battery output target, the second battery output target[s], and the third battery output target, and being effective to extend life of the battery.

2. The method of claim 1 further comprising determining with the one or more electronic controllers:
third engine output target based upon the total output demanded and the third battery output target,
a fourth engine output target based upon the third engine output target and a second engine constraint,
a fourth battery output target based upon the total output demanded and the fourth engine output target, and
a fifth battery output target based upon the fourth battery output target and a second battery constraint;
wherein the engine control command is constrained by the iterative determination of the first, second, third and fourth engine output targets, and the motor/generator command is constrained by iterative determination of the first, second, third, fourth and fifth battery output targets.

3. The method of claim 2 wherein engine constraint is based upon a negotiable performance or efficiency criterion for the engine, and the battery constraint is based upon a negotiable performance or efficiency criterion for the battery or motor/generator.

4. The method of claim 2 wherein the second engine constraint is based upon a predetermined engine operating limit, and the second battery constraint is based upon a predetermined battery or motor/generator operating limit.

5. The method of claim 1 further comprising determining with the one or more electronic controllers:
a third engine output target based upon the total output demanded and the third battery output target,
a fourth engine output target based upon the third engine output target and a second engine constraint,
a fourth battery output target based upon the total output demanded and the fourth engine output target,
a fifth battery output target based upon the fourth battery output target and a second battery or motor/generator constraint,
a fifth engine output target based upon the total output demanded and the fifth battery output target, and
a sixth engine output target based upon the fifth engine output target and a third engine constraint;
wherein the engine control command is constrained by the iterative determination of the first, second, third, fourth, fifth and sixth engine output targets, and the motor/generator command is constrained by iterative determination of the first, second, third, fourth and fifth battery output targets.

6. The method of claim 5 wherein the engine constraint and the second engine constraint are based upon a negotiable performance or efficiency criteria for the engine, and the battery constraint is based upon a negotiable performance or efficiency criterion for the battery or motor/generator.

7. The method of claim 5 wherein the third engine constraint is based upon a predetermined engine operating limit, and the second battery constraint is based upon a predetermined battery or motor/generator operating limit.

8. The method of claim 1 wherein the battery output target is determined based upon a vehicle speed and a state of charge target which varies based upon the vehicle speed.

9. The method of claim 1 wherein the total output demanded of the powertrain, the battery output target, the engine output target, the second engine output target, the second battery output target, and the third battery output target are calculated in units of power.

10. The method of claim 1 where the battery comprises an electrochemical storage medium and the motor/generator comprises an electric motor/generator.

11. A system for controlling a hybrid electric vehicle powertrain, the system comprising:
one or more electronic control units configured to perform repeated calculations of a desired engine output and a desired battery output, the repeated calculations comprising:
a total operational demand of the powertrain based at least in part upon a vehicle control device input,
a first desired battery output based upon a battery state of charge and independent of the vehicle control device input,
a first desired engine output based upon the total operational demand and the desired battery output,
a second desired engine output based upon the desired engine output and an engine constraint,
a second desired battery output based upon the total operational demand and the second desired engine output, and
a third desired battery output based upon the second desired battery output and a battery or motor/generator constraint;

wherein the one or more electronic controllers are configured to control an internal combustion engine using an engine control command determined based upon the repeated calculation of the first desired engine output and the second desired engine output and to control a motor/generator using a motor/generator command determined based upon the repeated calculation of the first desired battery output, the second desired battery output, and the third desired battery output;
wherein the one or more electronic control units are further configured to perform calculations of:
a third desired engine output based upon the total operational demand and the third desired battery output,
a fourth desired engine output based upon the third desired engine output and a second engine constraint,
a fourth desired battery output based upon the total operational demand and the fourth desired engine output, and
a fifth desired battery output based upon the fourth desired battery output and a second battery or motor/generator constraint,
a fifth desired engine output based upon the total operational demand and the fifth desired battery output, and
a sixth desired engine output based upon the fifth desired engine output and a third engine constraint;

wherein the engine control command is determined based upon the repeated calculation of the first, second, third, fourth, fifth and sixth desired engine outputs and the motor/generator command is determined based upon the repeated calculation of the first, second, third, fourth and fifth desired battery outputs.

12. The system of claim 11 wherein the one or more electronic control units are further configured to perform calculations of:
a third desired engine output based upon the total operational demand and the third desired battery output,
a fourth desired engine output

Assignees

• Cummins Inc

Inventors

• Books Martin T
• Freyermuth Vincent
• Hsieh Tung-Ming
• Muralidhar Praveen
• Zhou Lining

Classifications

• B60W10/08

  including control of electric propulsion units, e.g. motors or generators · CPC title

• Y02T10/6286

  Cross-Sectional Technologies · mapped topic

• B60W2710/248

  Current for loading or unloading · CPC title

• B60W2710/244

  Charge state · CPC title

• B60W10/06

  including control of combustion engines · CPC title