Methods and systems for driveline torque control

Patent metadata

Field	Value
Publication number	US-9802606-B2
Application number	US-201615065484-A
Country	US
Kind code	B2
Filing date	Mar 9, 2016
Priority date	Jan 15, 2014
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

Systems and methods for improving operation of a hybrid vehicle are presented. In one example, driveline oscillations are reduced during engine air-fuel ratio modulation. The driveline oscillations may be reduced via adjusting torque of a motor.

First claim

The invention claimed is:

1. A method for operating a driveline, comprising: not adjusting spark timing of an engine in response to engine air-fuel ratio changes when a battery state of charge is greater than a first threshold battery state of charge; and adjusting spark timing of the engine in response to engine air-fuel ratio changes when the battery state of charge is less than a second threshold battery state of charge;
and adjusting torque of a motor supplying torque to the driveline in response to the engine air-fuel ratio changes while not adjusting the spark timing, wherein while adjusting spark timing in response to engine air-fuel ratio changes, not adjusting torque of the motor responsive to the engine air-fuel ratio changes.

2. The method of claim 1 , where timing of commands to adjust the torque of the motor supplying torque to the driveline is adjusted in response to a fuel injection delay.

3. The method of claim 2 , where the timing of commands to adjust the torque of the motor supplying torque to the driveline is adjusted in response to a fuel injection to engine torque delay.

4. The method of claim 1 , where adjusting spark timing of the engine includes retarding spark timing of the engine in response to an engine air-fuel ratio change providing a richer engine air-fuel mixture.

5. The method of claim 1 , where adjusting spark timing of the engine includes advancing spark timing of the engine in response to an engine air-fuel ratio change providing a leaner engine air-fuel mixture.

Assignees

• Ford Global Tech Llc

Inventors

• Reed Dennis Craig
• Wright Robert
• Colvin Daniel
• Doering Jeffrey Allen

Classifications

• Y02T10/6252

  Cross-Sectional Technologies · mapped topic

• 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

• B60W2510/244

  Charge state · CPC title

• B60K2006/4825

  Electric machine connected or connectable to gearbox input shaft · CPC title

• B60Y2300/431

  Control of engine air-fuel ratio · CPC title