METHOD AND APPARATUS TO CONTROL INPUT SPEED PROFILE DURING INERTIA SPEED PHASE FOR A HYBRID POWERTRAIN SYSTEM

• US 20090112416A1
• Filed: 10/10/2008
• Published: 04/30/2009
• Est. Priority Date: 10/29/2007
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG, Daimler AG (Mercedes-Benz Group AG), Chrysler Group LLC (Stellantis NV)
• Original Assignee: BMW AG (Bayerische Motoren Werke AG), GM Global Technology Operations Incorporated (General Motors Company), Daimler AG (Mercedes-Benz Group AG), Chrysler LLC (Stellantis NV)
• Inventors: Heap, Anthony H., Sah, Jy-Jen F., Kaminsky, Lawrence A.
• Granted Patent: US 8,489,293 B2
• Time in Patent Office: Days
• US Class Current: 701/54
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 6/26 characterised by the motors or the generators
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/486 Operating parameters
• 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 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/11 using model predictive control [MPC] strategies, i.e. control methods based on models predicting performance utilising navigation and traffic information in the control strategy B60W20/12
• CPC Class Codes: B60W 2050/0042 Transfer function lag; delays
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/081 Speed
• CPC Class Codes: B60W 2510/104 Output speed
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 : Brake pedal position
• CPC Class Codes: B60W 2710/0644 : Engine speed
• CPC Class Codes: B60W 2710/083 : Torque
• CPC Class Codes: F16H 2037/0866 : Power split variators with distributing differentials, with the output of the CVT connected or connectable to the output shaft
• CPC Class Codes: F16H 2037/102 : the input or output shaft of the transmission is connected or connectable to two or more differentials
• CPC Class Codes: F16H 2037/104 : Power split variators with one end of the CVT connected or connectable to two or more differentials
• CPC Class Codes: F16H 2037/106 : with switching means to provide two variator modes or ranges
• CPC Class Codes: F16H 3/728 : with means to change ratio in the mechanical gearing
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility

Abstract

A method for controlling a powertrain includes executing a shift, determining a plurality of input acceleration profiles for controlling an engine and an electric machine, determining an input speed profile, and controlling operation of the engine and the electric machine based upon the input speed profile.

Claims

1. Method for controlling a powertrain comprising an electromechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member, the method comprising:

executing a shift;

determining a plurality of input acceleration profiles for controlling the engine and electric machine;

determining an input speed profile; and

controlling operation of the engine and the electric machine based upon the input speed profile.

2. The method of claim 1, wherein determining a plurality of input speed acceleration profiles comprises:

determining an input acceleration lead immediate profile based upon a desired transition of an input speed; and

determining an input acceleration immediate profile based upon said input acceleration lead immediate profile and delayed based upon a lead period calibrated to reaction times of torque generating devices within said powertrain.

3. The method of claim 1, wherein determining a plurality of input speed acceleration profiles comprises:

determining an input acceleration immediate profile based upon transitioning from an initial input speed to a target input speed and based upon an input acceleration lead predicted profile; and

determining an input acceleration lead immediate profile, wherein said input acceleration immediate profile is delayed from said input acceleration lead immediate profile based upon a lead period calibrated to reaction times of said engine and said electric machine.

4. The method of claim 3, wherein determining said input acceleration immediate profile comprises:

determining a total desired speed phase time;

determining a first sub-phase time based upon said total desired speed phase time;

determining a third sub-phase time based upon based upon said total desired speed phase time;

determining a second sub-phase time based upon said total desired speed phase time, said first sub-phase time, and said third sub-phase time; and

determining said input acceleration immediate profile based upon said first sub-phase time, said second sub-phase time, said third sub-phase time, and a peak speed phased input acceleration.

5. The method of claim 1, wherein said input speed profile includes an S-shaped profile based upon transitioning from an initial input speed to a target input speed and based upon an input acceleration lead predicted profile.

6. Method for controlling a powertrain comprising an electromechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member, said method comprising:

monitoring an accelerator pedal position;

monitoring an input speed;

monitoring an output speed;

commanding a shift to a desired operating range state comprising an inertia speed phase;

determining an input acceleration immediate profile for controlling the engine based upon said input speed, said desired operating range state, said accelerator pedal position, and said output speed; and

controlling operation of said engine based upon said input acceleration immediate profile.

7. The method of claim 6, further comprising controlling operation of said electric machine based upon said input acceleration immediate profile.

8. The method of claim 6, further comprising controlling operation of a plurality of electric machines based upon said input acceleration immediate profile.

9. The method of claim 6, wherein controlling operation of said engine includes a lead period based upon reaction times of said engine to engine commands to effect said input acceleration immediate profile.

10. The method of claim 6, wherein determining said input acceleration immediate profile for controlling the engine includes a sensor delay factor.

11. The method of claim 6, wherein determining said input acceleration immediate profile for controlling the engine comprises:

determining a total desired speed phase time based upon said accelerator position, said input speed, and said desired operating range state; and

determining said input acceleration immediate profile utilizing sub-phases describing said inertia speed phase.

12. The method of claim 11, wherein determining said input acceleration immediate profile utilizing said sub-phases comprises:

determining a target input speed based upon said desired operating range state and said output speed;

determining a input acceleration lead predicted profile based upon said desired operating range state and said output speed;

determining a first sub-phase describing a transition from an initial input speed and initial input acceleration;

determining a third sub-phase describing a transition to said target input speed and said input acceleration lead predicted profile; and

determining a second sub-phase based upon said first sub-phase, said second sub-phase, and said total desired speed phase time.

13. The method of claim 12, wherein defining said second sub-phase comprises:

defining a peak speed phase input acceleration based upon said target input speed, said input speed, and said total desired speed phase time.

14. Apparatus for controlling a powertrain comprising an electromechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member, said apparatus comprising:

a selectively applied clutch within said transmission transmitting torque from an input member to said output member; and

a shift execution module, including programming, in the course of executing said shift, effective to

determine a plurality of input acceleration profiles for controlling the engine and the electric machine,

determine an input speed profile, and

control operation of the engine and the electric machine based upon the input speed profile.

15. The apparatus of claim 14, wherein said programming effective to determine said plurality of input acceleration profiles comprises programming effective to:

determine an input acceleration immediate profile based upon transitioning from an initial input speed to a target input speed and based upon an input acceleration lead predicted profile; and

determine an input acceleration lead immediate profile, wherein said input acceleration immediate profile is delayed from said input acceleration lead immediate profile based upon a lead period calibrated to reaction times of said engine and said electric machine.

16. The apparatus of claim 15, wherein said programming effective to determine said input acceleration immediate profile comprises programming effective to:

determine a total desired speed phase time;

determine a first sub-phase time based upon said total desired speed phase time;

determine a third sub-phase time based upon based upon said total desired speed phase time;

determine a second sub-phase time based upon said total desired speed phase time, said first sub-phase time, and said third sub-phase time; and

determine said input acceleration immediate profile based upon said first sub-phase time, said second sub-phase time, said third sub-phase time, and a peak speed phased input acceleration.