Method and system for stopping an engine

• US 9,393,949 B2
• Filed: 03/16/2015
• Issued: 07/19/2016
• Est. Priority Date: 10/08/2012
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Gibson, Alex O'Connor, Oshinsky, David, Lee, Seung-Hoon, Doering, Jeffrey A., Reed, Dennis Craig
• Primary Examiner(s): Hlavka, David J
• Application Number:
  US14/659,221
• Publication Number:
  US 20150183416A1
• Time in Patent Office: 491 Days
• US Class Current: 1/1
• CPC Class Codes: B60K 2006/4825 Electric machine connected or connectable to gearbox input shaft
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/40 Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers power-up or power-down of the driveline B60W30/192
• CPC Class Codes: B60W 2510/02 Clutches
• CPC Class Codes: B60W 2510/06 Combustion engines, Gas turbines
• CPC Class Codes: B60W 2510/0685 Engine crank angle
• CPC Class Codes: B60W 2710/06 Combustion engines, Gas turbines
• CPC Class Codes: B60W 2710/0644 Engine speed
• CPC Class Codes: B60W 30/20 Reducing vibrations in the driveline
• CPC Class Codes: B60Y 2300/48 Engine direct start by injecting fuel and fire
• CPC Class Codes: B60Y 2400/48 Vibration dampers, e.g. dual mass flywheels
• CPC Class Codes: F02N 19/005 Aiding engine start by starting from a predetermined position, e.g. pre-positioning or reverse rotation
• CPC Class Codes: F02N 2019/008 the engine being stopped in a particular position
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A method and a system for improving operation of a hybrid vehicle are presented. In one example, a disconnect clutch is operated in response to an engine stop request to adjust an engine stopping position during an engine shutdown. The approach may reduce engine starting time after the engine stop.

Claims

1. A system for stopping an engine, comprising:

an engine;

a driveline integrated starter/generator (DISG);

a disconnect clutch positioned in a driveline between the engine and the DISG;

a dual mass flywheel positioned in the driveline between the engine and the disconnect clutch; and

a controller, the controller including non-transitory executable instructions stored in memory for adjusting stopping position of the engine via adjusting an actuation force applied to the disconnect clutch.

2. The system of claim 1, where the non-transitory executable instructions for adjusting the actuation force include slipping the disconnect clutch after at least one of spark and fuel flow to the engine cease.

3. The system of claim 1, where the non-transitory executable instructions for adjusting the actuation force include closing the disconnect clutch before at least one of spark and fuel flow to the engine cease.

4. The system of claim 1, further comprising additional non-transitory executable instructions for cancelling driveline torque disturbances of the dual mass flywheel.

5. The system of claim 1, further comprising additional non-transitory executable instructions for reversing a direction of the engine after an engine stop and before an engine start.