Method and apparatus to control input speed profile during inertia speed phase for a hybrid powertrain system

• US 8,489,293 B2
• Filed: 10/10/2008
• Issued: 07/16/2013
• Est. Priority Date: 10/29/2007
• Status: Expired due to Fees

• Current Assignee: Bayerische Motoren Werke AG, Daimler AG (Mercedes-Benz Group AG), Chrysler Group LLC (Stellantis NV)
• Original Assignee: Bayerische Motoren Werke AG, GM Global Technology Operations LLC (General Motors Company), Daimler AG (Mercedes-Benz Group AG), Chrysler Group LLC (Stellantis NV)
• Inventors: Heap, Anthony H., Kaminsky, Lawrence A., Sah, Jy-Jen F.
• Primary Examiner(s): Badii, Behrang
• Application Number:
  US12/249,221
• Publication Number:
  US 20090112416A1
• Time in Patent Office: 1,740 Days
• Field of Search: 701/70, 701/121, 701/79, 701/54, 701/22, 701/51, 701/69, 701/84, 701/80, 477/120, 477/3, 477/5, 180/65.225, 180/65.23, 180/65.21, 180/65.29, 903/902
• 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 electro-mechanical 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 of said transmission from a first operating range state to a second operating range state, comprising;

determining an input speed profile to transition an input speed of an input shaft of said transmission from an initial input speed corresponding to said first operating range state to a target input speed corresponding to said second operating range state;

determining an input acceleration immediate profile of said input shaft for controlling said electric machine based upon said input speed profile;

determining an input acceleration lead immediate profile for said controlling said engine based upon said input acceleration immediate profile and a lead time for said engine;

controlling operation of the engine based upon said input acceleration lead immediate profile; and

controlling operation of the electric machine based upon the input acceleration immediate profile;

wherein said lead time is based upon a difference in a response time for said engine to a response time for said electric machine.

2. The method of claim 1, wherein determining said input acceleration immediate profile for controlling said electric machine is further based upon an input acceleration lead predicted profile.

3. The method of claim 2, wherein determining said input speed 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 speed 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.

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

5. Apparatus for controlling a powertrain comprising an electro-mechanical 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:

said transmission comprising a selectively applied clutch within said transmission transmitting torque to said output member; and

a shift execution module, including programming, in the course of executing a shift of said transmission from a first operating range state to a second operating range state, effective to

determine an input speed profile to transition an input speed of an input shaft of said transmission from an initial input speed corresponding to said first operating range state to a target input speed corresponding to said second operating range state,

determine an input acceleration immediate profile of said input shaft for controlling said electric machine based upon said input speed profile,

determine an input acceleration lead immediate profile for said controlling said engine based upon said input acceleration immediate profile and a lead time for said engine,

control operation of said engine based upon said input acceleration lead immediate profile, and

control operation of said electric machine based upon said input acceleration immediate profile;

wherein said lead time is based upon a difference in a response time for said engine to a response time for said electric machine.

6. The apparatus of claim 5, wherein said programming effective to determine said input speed 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 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 speed 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.