Method for controlling pump transitions in a multi-mode hybrid transmission

Patent metadata

Field	Value
Publication number	US-9014934-B2
Application number	US-46809409-A
Country	US
Kind code	B2
Filing date	May 19, 2009
Priority date	May 19, 2009
Publication date	Apr 21, 2015
Grant date	Apr 21, 2015

Abstract

A method of controlling a pump for a hybrid transmission includes commanding a first line pressure of the transmission and deriving a first torque value—an open-loop torque value—from the first line pressure command, and commanding the pump to operate at the first torque value. The method monitors actual speed of the pump and derives a second torque value—a closed-loop torque value—therefrom. A third torque value is derived from the first and second torque values, and the pump commanded to operate at the third torque value. A first speed value may be derived from the first line pressure command, and the second torque value derived from the difference between the monitored and the first speed values. Deriving the third torque value may include a substantially-linear combination of the first and second torque values.

First claim

The invention claimed is:

1. A method of controlling a pump for a hybrid transmission, comprising:
commanding a first line pressure of the transmission;
deriving a first torque value from the first line pressure command;
commanding the pump to operate at the first torque value, such that the pump operates at the first torque value;
monitoring an actual speed of the pump;
deriving a second torque value from the monitored actual speed of the pump;
deriving a third torque v…

Assignees

• Sah Jy-Jen F
• Gm Global Tech Operations Inc

Inventors

• Sah Jy-Jen F

Classifications

• F16H59/36

  Mechanical Engineering · mapped topic

• F16H61/06

  Mechanical Engineering · mapped topic

• F16H61/0031 Primary

  Mechanical Engineering · mapped topic

• F16H61/0021

  Mechanical Engineering · mapped topic

• Y02T10/62

  Cross-Sectional Technologies · mapped topic