METHODS AND SYSTEM FOR OPERATING A VEHICLE TRANSMISSION

• US 20160236670A1
• Filed: 02/12/2015
• Published: 08/18/2016
• Est. Priority Date: 02/12/2015
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Johri, Rajit, Liang, Wei, Yamazaki, Mark Steven, Wang, Xiaoyong, Doering, Jeffrey Allen, Kuang, Ming Lang
• Granted Patent: US 10,189,460 B2
• Time in Patent Office: 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 6/387 Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/023 Fluid clutches
• CPC Class Codes: B60W 10/024 including control of torque converters
• 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 10/115 with planetary gears
• 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 20/14 in conjunction with braking regeneration
• CPC Class Codes: B60W 2510/0266 Moment of inertia
• CPC Class Codes: B60W 2510/088 Inertia
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2710/024 of torque converter lock-up clutch
• CPC Class Codes: B60W 2710/028 Clutch input shaft speed
• CPC Class Codes: B60W 2710/0644 Engine speed
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 2710/1011 : Input shaft speed, e.g. turbine speed
• CPC Class Codes: B60W 30/18127 : Regenerative braking
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements

Abstract

Systems and methods for operating a hybrid vehicle driveline that includes an engine and a motor are presented. In one example, the systems and methods include one or more speed control modes where torque output of a motor is adjusted responsive to different control parameters in the different control modes.

Claims

1. A driveline operating method, comprising:

reducing a torque output range of authority of a motor to a non-zero value in a driveline operating in a torque converter impeller speed control mode in response to a battery state of charge exceeding a threshold level.

2. The method of claim 1, where the driveline operating in the torque converter impeller speed control mode includes an engine operating in a speed control mode, and where the motor is operating in a torque control mode while the driveline is operating in the torque converter impeller speed control mode.

3. The method of claim 2, where the engine is operated in the torque converter impeller speed control mode via adjusting engine torque to maintain a desired driveline speed, and where the motor is operated in the torque control mode where motor torque is maintained in the torque output range of authority and motor speed is not a basis for controlling the motor.

4. The method of claim 1, where the torque range of authority is reduced from a range extending from a maximum positive motor torque to a maximum negative motor torque.

5. The method of claim 1, where the driveline is operated in the torque converter impeller speed control mode when a transmission of the driveline is in neutral or park.

6. The method of claim 1, where the torque output range of authority is based on driveline disconnect clutch inertia and motor inertia.

7. The method of claim 6, where the torque output range of authority is further based on driveline angular acceleration.

8. A driveline operating method, comprising:

operating a driveline in a first torque converter impeller speed control mode in response to a battery first state of charge; and

operating the driveline in a second torque converter impeller speed control mode in response to a second battery state of charge.

9. The method of claim 8, where in the first torque converter impeller speed control mode, torque of a motor in the driveline is adjusted responsive to torque converter impeller speed.

10. The method of claim 9, where in the second torque converter impeller speed control mode, the torque of the motor is adjusted responsive to torque converter impeller angular acceleration, driveline disconnect inertia, and motor inertia.

11. The method of claim 10, where in the first torque converter impeller speed control mode, torque of an engine is adjusted responsive to a driver demand torque.

12. The method of claim 11, where in the second torque converter impeller speed control mode, torque of the engine is adjusted responsive to torque converter impeller speed.

13. The method of claim 8, further comprising starting an engine if the engine is stopped when the driveline enters the second torque converter impeller speed control mode.

14. The method of claim 8, where the second battery state of charge is greater than the battery first state of charge.

15. A driveline, comprising:

an engine;

a motor;

a battery electrically coupled to the motor;

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

a transmission coupled to the motor; and

a controller including executable instructions stored in non-transitory memory for operating the driveline in a first driveline speed control mode and a second driveline speed control mode, and instructions for switching between the first driveline speed control mode and the second driveline speed control mode in response to charge of the battery exceeding a threshold charge.

16. The driveline of claim 15, where in the first driveline speed control mode, torque of the motor in the driveline is adjusted responsive to torque converter impeller speed.

17. The driveline of claim 15, where in the second driveline speed control mode, torque of the motor in the driveline is adjusted responsive to torque converter impeller angular acceleration, driveline disconnect inertia, and motor inertia.

18. The driveline of claim 15, where in the first driveline speed control mode, torque of the engine in the driveline is adjusted responsive to driver demand torque.

19. The driveline of claim 15, where in the second driveline speed control mode, torque of the engine in the driveline is adjusted responsive to torque converter impeller speed.

20. The driveline of claim 15, where the first driveline speed control mode or the second driveline speed control mode is invoked when the transmission is in park or neutral.