METHODS AND SYSTEMS FOR ENGINE STOPPING

• US 20130296121A1
• Filed: 02/25/2013
• Published: 11/07/2013
• Est. Priority Date: 05/04/2012
• 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, Doering, Jeffrey Allen, Banker, Adam Nathan, Oshinsky, David, Reed, Dennis Craig
• Granted Patent: US 9,393,954 B2
• Time in Patent Office: Days
• US Class Current: 477/5
• CPC Class Codes: B60K 2006/268 Electric drive motor starts the engine, i.e. used as starter motor
• CPC Class Codes: B60K 2006/4825 Electric machine connected or connectable to gearbox input shaft
• CPC Class Codes: B60K 6/26 characterised by the motors or the generators
• CPC Class Codes: B60K 6/30 characterised by chargeable mechanical accumulators, e.g. flywheels
• CPC Class Codes: B60K 6/387 Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
• 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 20/16 for reducing engine exhaust emissions
• 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 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/0685 Engine crank angle
• CPC Class Codes: B60W 2710/021 Clutch engagement state
• CPC Class Codes: B60W 2710/0627 Fuel flow rate
• CPC Class Codes: B60W 30/182 Selecting between different operative modes, e.g. comfort and performance modes
• CPC Class Codes: B60W 30/192 Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
• CPC Class Codes: B60Y 2200/92 Hybrid vehicles
• CPC Class Codes: B60Y 2300/182 Selecting between different operative modes, e.g. comfort and performance modes
• CPC Class Codes: B60Y 2300/192 Power-up or power-down of the driveline, e.g. start up of a cold engine
• CPC Class Codes: B60Y 2300/42 Control of clutches
• CPC Class Codes: B60Y 2300/43 : Control of engines
• CPC Class Codes: F02D 2250/24 : by using an external load, e.g. a generator
• CPC Class Codes: F02D 41/022 : in relation with the clutch status
• CPC Class Codes: F02D 41/042 : for stopping the engine
• CPC Class Codes: F02D 41/062 : for starting F02D41/061 takes precedence
• CPC Class Codes: F02D 41/3029 : further comprising a homogeneous charge spark-ignited mode
• CPC Class Codes: F02D 41/40 : with means for controlling injection timing or duration
• CPC Class Codes: F02D 41/402 : Multiple injections
• CPC Class Codes: F02N 11/04 : the motors being associated with current generators
• CPC Class Codes: F02N 11/0844 : with means for restarting the engine directly after an engine stop request, e.g. caused by change of driver mind
• CPC Class Codes: F02N 11/0855 : during engine shutdown or after engine stop before start command, e.g. pre-engagement of pinion
• CPC Class Codes: F02N 2019/008 : the engine being stopped in a particular position
• CPC Class Codes: F02N 2300/2002 : using different starting modes, methods, or actuators depending on circumstances, e.g. engine temperature or component wear
• CPC Class Codes: F02N 2300/2004 : using adaptive control
• CPC Class Codes: F16F 15/30 : Flywheels F16F15/16, F16F15/28 take precedence; suppression of vibrations in rotating systems using elastic members or friction-damping members moving with the system, i.e. split flywheels or single masses connected to a hub by elastic members or friction-damping members F16F15/12; rotary-body aspects in general F16C13/00, F16C15/00
• CPC Class Codes: Y02T 10/40 : Engine management systems
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y10S 903/902 : Prime movers comprising electrical and internal combustion motors
• CPC Class Codes: Y10S 903/914 : Actuated, e.g. engaged or disengaged by electrical, hydraulic or mechanical means
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements
• CPC Class Codes: Y10S 903/946 : Characterized by control of driveline clutch
• CPC Class Codes: Y10S 903/96 : having chargeable mechanical accumulator

Abstract

Systems and methods for improving operation of a hybrid vehicle are presented. In one example, an engine is stopped to a desired position via slipping a driveline disconnect clutch so that engine starting may be improved.

Claims

1. An engine stopping method, comprising:

adjusting a speed of a driveline integrated starter/generator (DISG) to a desired speed that provides a desired transmission clutch oil line pressure in response to a request to stop engine rotation; and

slipping a driveline disconnect clutch in a driveline between the DISG and the engine to stop the engine at a desired position.

2. The method of claim 1, where the desired position a predetermined number of crankshaft degrees before top-dead-center compression stroke of a selected cylinder.

3. The method of claim 1, further comprising ceasing fuel flow and spark to engine cylinders in response to the request to stop engine rotation.

4. The method of claim 1, further comprising tying a transmission output shaft to a transmission case in response to the request to stop engine rotation.

5. The method of claim 1, further comprising opening the driveline disconnect clutch at substantially zero engine speed.

6. The method of claim 5, further comprising continuing to rotate the DISG while the engine is at zero speed.

7. The method of claim 1, further comprising activating and deactivating the DISG while the engine speed is zero.

8. An engine stopping method, comprising:

closing a driveline disconnect clutch in response to a request to stop engine rotation;

adjusting a speed of a driveline integrated starter/generator (DISG) to a desired engine speed profile that decelerates toward zero engine speed; and

opening the driveline disconnect clutch at a predetermined engine speed.

9. The method of claim 8, further comprising tying a transmission output shaft to a transmission case in response to the request to stop the engine.

10. The method of claim 8, further comprising ceasing fuel flow and spark to engine cylinders in response to the request to stop the engine.

11. The method of claim 8, where the driveline disconnect clutch is in a driveline positioned between an engine and the DISG.

12. The method of claim 8, further comprising opening the driveline disconnect clutch at a predetermined position.

13. The method of claim 8, where speed of the DISG is increased when engine speed is less than the desired engine speed profile.

14. The method of claim 8, where speed of the DISG is decreased when engine speed is greater than the desired engine speed profile.

15. A vehicle system, comprising:

an engine;

a dual mass flywheel (DMF) including a first side mechanically coupled to the engine;

a driveline disconnect clutch mechanically including a first side coupled to a second side of the dual mass flywheel;

a driveline integrated starter/generator (DISG) including a first side coupled to a second side of the driveline disconnect clutch;

a transmission selectively coupled to the engine via the driveline disconnect clutch; and

a controller including executable instructions stored in non-transitory memory to adjust operation of the driveline disconnect clutch in response to a request to stop engine rotation.

16. The vehicle system of claim 15, where the driveline disconnect clutch is at least partially closed.

17. The vehicle system of claim 16, where the driveline disconnect clutch is fully closed.

18. The vehicle system of claim 17, further comprising additional instructions to open the driveline disconnect clutch at a predetermined engine speed.

19. The vehicle system of claim 18, further comprising operating the DISG at a speed that provides a desired transmission clutch oil line pressure.

20. The vehicle system of claim 19, further comprising additional instructions to selectively deactivate the DISG at zero engine speed.