Methods and systems for a vehicle driveline power take off

• US 9,327,728 B2
• Filed: 08/25/2014
• Issued: 05/03/2016
• 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, Pietron, Gregory Michael, Fujii, Yuji, Doering, Jeffrey Allen, McCallum, James William Loch
• Primary Examiner(s): Fleming, Faye M
• Application Number:
  US14/468,161
• Publication Number:
  US 20150006011A1
• Time in Patent Office: 617 Days
• US Class Current: 1/1
• CPC Class Codes: B60K 17/28 characterised by arrangement, location, or type of power take-off
• 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: B60K 6/52 Driving a plurality of drive axles, e.g. four-wheel drive
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/023 Fluid clutches
• CPC Class Codes: B60W 10/026 of lock-up 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 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• CPC Class Codes: B60W 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• 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 2510/1005 Transmission ratio engaged
• CPC Class Codes: B60W 2520/403 between front and rear axle
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2540/16 Ratio selector position
• CPC Class Codes: B60W 2710/021 Clutch engagement state
• CPC Class Codes: B60W 2710/024 of torque converter lock-up clutch
• CPC Class Codes: B60W 2710/027 : Clutch torque
• CPC Class Codes: B60W 2710/065 : Idle condition
• CPC Class Codes: B60W 2710/083 : Torque
• CPC Class Codes: B60W 30/02 : Control of vehicle driving stability
• CPC Class Codes: B60W 30/18 : Propelling the vehicle
• CPC Class Codes: B60W 30/18018 : Start-stop drive, e.g. in a traffic jam
• CPC Class Codes: B60W 30/18045 : Rocking, i.e. fast change between forward and reverse
• CPC Class Codes: B60W 30/18063 : Creeping
• CPC Class Codes: B60Y 2200/92 : Hybrid vehicles
• CPC Class Codes: B60Y 2300/188 : Controlling power parameters of the driveline, e.g. determining the required power
• CPC Class Codes: B60Y 2300/42 : Control of clutches
• CPC Class Codes: B60Y 2300/421 : Control of lock-up type clutches, e.g. in a torque converter
• CPC Class Codes: B60Y 2300/43 : Control of engines
• CPC Class Codes: B60Y 2300/60 : Control of electric machines, e.g. problems related to electric motors or generators
• CPC Class Codes: F01P 3/00 : Liquid cooling
• CPC Class Codes: F02D 41/065 : at hot start or restart F02D41/067 takes precedence
• CPC Class Codes: F02N 11/003 : said electric motor being also used as a drive for auxiliaries, e.g. for driving transmission pumps or fuel pumps during engine stop
• CPC Class Codes: F02N 11/04 : the motors being associated with current generators
• CPC Class Codes: F02N 11/0833 : Vehicle conditions F02N11/0822, F02N11/0825 take precedence
• CPC Class Codes: F02N 11/084 : State of vehicle accessories, e.g. air condition or power steering
• CPC Class Codes: F02N 2200/124 : Information about road conditions, e.g. road inclination or surface
• CPC Class Codes: Y02T 10/40 : Engine management systems
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y10S 477/90 : Control signal is vehicle weight
• CPC Class Codes: Y10S 903/916 : with plurality of drive axles
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements

Abstract

Systems and methods for improving operation of a power take off are presented. In one example, the power take off may be rotated in two different directions. The approaches may improve operation of a power take off device.

Claims

1. A method of operating a vehicle, comprising:

while the vehicle is stationary and parked, operating a power take off (PTO), including rotating a PTO output via rotating a first PTO power source in a first direction and a second direction; and

rotating the PTO output via a positive torque provided by the first PTO power source and a positive torque provided by a second PTO power source.

2. The method of claim 1, further comprising opening a driveline disconnect clutch when rotating the PTO in the second direction.

3. The method of claim 1, further comprising opening or closing a driveline disconnect clutch when rotating the PTO in the first direction.

4. The method of claim 3, where the first PTO power source is a driveline integrated starter/generator (DISG), and where the second PTO power source is an engine, and where the DISG is positioned in a driveline between a transmission and the engine.

5. The method of claim 1, further comprising ceasing to operate the first PTO power source in response to a battery state of charge (SOC) less than a threshold.

6. The method of claim 1, further comprising adjusting a speed of the PTO output via adjusting the positive torque provided by the first PTO power source.

7. The method of claim 1, further comprising adjusting a speed of the PTO output via adjusting the positive torque provided by the second PTO power source.

8. A method of operating a power take off (PTO) of a vehicle, comprising:

rotating a mechanical device external the vehicle and other than vehicle wheels via a PTO output by way of rotating a first PTO power source including an engine and a second PTO power source, the first PTO power source and the second PTO power source providing positive torque to a vehicle driveline;

varying output of the first PTO power source and the second PTO power source in response to available output of the second PTO power source; and

selectively shutting down the engine during stopped vehicle conditions.

9. The method of claim 8, where the second PTO power source is a driveline integrated starter/generator (DISG).

10. The method of claim 8, where a driveline disconnect clutch positioned in a driveline between the first PTO power source and the second PTO power source is in a closed state.

11. The method of claim 8, further comprising adjusting output of the first PTO power source in response to a wheel torque that is less than a desired wheel torque.

12. The method of claim 8, further comprising adjusting output of the second PTO power source in response to a wheel torque that is less than a desired wheel torque.

13. A method for a vehicle, comprising:

rotating a device external the vehicle and different than vehicle wheels via rotating a power take off (PTO) output by way of rotating an electric machine in a first direction;

reversing rotation of the PTO output via rotating the electric machine in a second direction different than the first direction, the electric machine positioned in a vehicle driveline; and

selecting shutting down the engine during stopped vehicle conditions.

14. The method of claim 13, where the electric machine is positioned between an engine and a torque converter.

15. The method of claim 14, where the electric machine is a driveline integrated starter generator (DISG).

16. The method of claim 15, where the electric machine is also positioned between a driveline disconnect clutch and the torque converter.

17. The method of claim 16, further comprising ceasing output of the DISG in response to a PTO operated device being at a travel limit.

18. The method of claim 16, where the driveline disconnect clutch is in an open state while rotating the PTO output.

19. The method of claim 13, where the vehicle including the vehicle driveline is operated in a stationary PTO mode where the vehicle does not move.

20. The method of claim 13, further comprising providing an indication of an impending PTO shutdown in response to a battery state of charge (SOC) and ceasing to provide power to the PTO output via a PTO power source after providing the indication of the impending PTO shutdown.