Methods and systems for engine stopping

• US 9,789,868 B2
• Filed: 06/16/2016
• Issued: 10/17/2017
• 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
• Primary Examiner(s): Bishop, Erin D
• Application Number:
  US15/184,837
• Publication Number:
  US 20160297427A1
• Time in Patent Office: 488 Days
• Field of Search: None
• 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. 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, and additional instructions to open the driveline disconnect clutch at a predetermined engine speed.

2. The vehicle system of claim 1, wherein the driveline disconnect clutch is at least partially closed.

3. The vehicle system of claim 2, wherein the driveline disconnect clutch is fully closed.

4. The vehicle system of claim 3, further comprising additional instructions to cease fuel flow to the engine in response to the request to stop engine rotation.

5. The vehicle system of claim 4, further comprising additional instructions to operate the DISG at a speed that provides a desired transmission clutch oil line pressure.

6. The vehicle system of claim 5, further comprising additional instructions to selectively deactivate the DISG at zero engine speed.

7. 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, the transmission including an output shaft and a case; and

a controller including executable instructions stored in non-transitory memory to close the driveline disconnect clutch when the driveline disconnect clutch is open in response to a request to stop engine rotation.

8. The vehicle system of claim 7, further comprising additional instructions to cease spark and fuel flow to the engine and open the driveline disconnect clutch at a predetermined engine speed.

9. The vehicle system of claim 8, further comprising additional instructions to operate the DISG at a speed that provides a desired transmission clutch oil line pressure.

10. The vehicle system of claim 7, further comprising additional instructions to tie the transmission output shaft to the case.

11. The vehicle system of claim 7, further comprising additional instructions to adjust DISG speed to control engine speed.

12. 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, the transmission including an output shaft and a case; and

a controller including executable instructions stored in non-transitory memory to determine a desired transmission oil line pressure and rotate the DISG at a speed to provide the desired transmission oil line pressure in response to a request to stop engine rotation.

13. The vehicle system of claim 12, further comprising additional instructions to cease spark and fuel flow to the engine and slip the driveline disconnect clutch in response to the request to stop engine rotation.

14. The vehicle system of claim 12, further comprising additional instructions to open the driveline disconnect clutch in response to the request to stop engine rotation.

15. The vehicle system of claim 12, further comprising additional instructions to tie the transmission output shaft to the case.

16. The vehicle system of claim 12, further comprising additional instructions to adjust DISG speed to control engine speed.