Optimal engine operating power management strategy for a hybrid electric vehicle powertrain

Patent metadata

Field	Value
Publication number	US-10023175-B2
Application number	US-201113273343-A
Country	US
Kind code	B2
Filing date	Oct 14, 2011
Priority date	Aug 2, 2005
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A method for managing power in a hybrid electric vehicle powertrain having multiple components including at least two of a group comprising an engine, a motor, a generator and a high voltage battery includes computing power losses for the individual components. An engine operating speed and torque for a given vehicle speed and total power command is determined so that total power losses for powertrain components are minimized.

First claim

What is claimed is:

1. An engine power management method for a hybrid vehicle having an engine, a generator, an electric motor, and a traction battery, the engine coupled through a planetary gearset to the generator, the electric motor, and vehicle wheels, the method comprising:
receiving a vehicle speed signal and a total power command associated with a current driver demanded power;
calculating power losses for the engine, the generator, the electric motor, the traction battery, and the planetary gearset using the vehicle speed and the total power command;
combining the power losses to obtain a total powertrain loss;
determining a target engine speed based on the total powertrain loss in response to the total power command;
adjusting engine torque to a value corresponding to the target engine speed; and
controlling rate of increase of the engine speed until the target engine speed corresponding to a changed total power command is attained.

Assignees

• Kozarekar Shailesh
• Kuang Ming
• Supina Joseph
• Syed Fazal
• Andreae Morgan
• Freyermuth Vincent
• Ford Global Tech Llc

Inventors

• Kozarekar Shailesh
• Kuang Ming
• Supina Joseph
• Syed Fazal
• Andreae Morgan
• Freyermuth Vincent

Classifications

• B60W2710/0644

  Engine speed · CPC title

• B60W20/15 Primary

  Control strategies specially adapted for achieving a particular effect · CPC title

• B60W10/06

  including control of combustion engines · CPC title

• B60W20/00

  Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)} · CPC title

• B60W20/11

  using model predictive control [MPC] strategies, i.e. control methods based on models predicting performance {(utilising navigation and traffic information in the control strategy B60W20/12)} · CPC title