Method and apparatus for developing a deceleration-based synchronous shift schedule

• US 8,825,320 B2
• Filed: 10/03/2008
• Issued: 09/02/2014
• Est. Priority Date: 11/02/2007
• Status: Active Grant

• 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., Kim, Kee Yong
• Primary Examiner(s): TISSOT, ADAM D
• Application Number:
  US12/244,827
• Publication Number:
  US 20090118949A1
• Time in Patent Office: 2,160 Days
• Field of Search: 477/3, 477/20, 477/46, 180/65.25, 180/65.27, 180/65.285, 180/65.235, 180/65.265, 180/65.31, 903/903, 903/909, 903/918, 903/919, 903/945, 903/946, 701/22, 701/54, 701/59, 701/84, 701/87
• US Class Current: 701/55
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• 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: 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 20/30 Control strategies involving selection of transmission gear ratio control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H
• CPC Class Codes: B60W 30/19 Improvement of gear change, e.g. by synchronisation or smoothing gear shift
• 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 2061/022 Calculation or estimation of optimal gear ratio, e.g. best ratio for economy drive or performance according driver preference, or to optimise exhaust emissions
• CPC Class Codes: F16H 61/0213 characterised by the method for generating shift signals
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A method for controlling a powertrain includes monitoring a desired synchronous transmission shift during deceleration of an output member including a desired operating range state, monitoring an output speed, predicting output deceleration through the desired synchronous transmission shift, determining a penalty cost associated with the desired synchronous transmission shift based upon an input speed profile resulting from the predicted output deceleration and from the desired synchronous transmission shift, and executing the synchronous transmission shift based upon the penalty cost.

Claims

1. Method for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine, said transmission configured to transmit mechanical power to an output member in one of a plurality of fixed gear and continuously variable operating range states, the method comprising:

monitoring an output speed and an operator torque request;

for each of a plurality of potential destination operating range states;

determining a respective output member deceleration through a respective synchronous transmission shift to achieve the respective potential destination operating range state,

determining a respective input speed profile based upon said respective output member deceleration, the output speed, and the operator torque request through said respective synchronous transmission shift, and

determining a respective penalty cost based upon said respective input speed profile; and

executing in a control module one of said respective synchronous transmission shifts to the corresponding one of said plurality of potential destination operating range states based upon said respective penalty costs.

2. The method of claim 1, wherein, for each of the plurality of potential destination operating range states, determining said respective penalty cost based upon the respective input speed profile comprises:

predicting a respective minimum input speed resulting during said respective synchronous transmission shift based upon said respective input speed profile; and

determining said respective penalty cost associated with said respective minimum input speed.

3. The method of claim 2, wherein determining said respective penalty cost further comprises determining whether said respective minimum input speed violates a minimum allowed input speed.

4. The method of claim 2, wherein determining said respective penalty cost further comprises evaluating drivability impacts of said respective minimum input speed.

5. The method of claim 2, wherein determining said respective penalty cost further comprises evaluating fuel efficiency impacts of said respective minimum input speed.

6. The method of claim 2, wherein determining said respective penalty cost further comprises utilizing a look-up table calibrated according to effects of transitions to said respective potential destination operating range state including operation at said respective minimum input speed.

7. Method for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and first and second electric machines, said transmission configured to transmit mechanical power to an output member in one of a plurality of fixed gear and continuously variable operating range states, the method comprising:

monitoring a current operating range state of said transmission;

monitoring an output speed and an operator torque request;

for each of a plurality of potential destination operating range states;

determining a respective output member deceleration through a respective synchronous transmission shift to achieve the respective potential destination operating range state,

determining a respective input speed profile based upon said respective output member deceleration, the output speed, and the operator torque request through said respective synchronous transmission shift, and

determining a respective penalty cost based upon said respective input speed profile; and

selecting and executing in a control module a synchronous transmission shift to one of the plurality of potential destination operating range states based upon said penalty cost.

8. The method of claim 7, further comprising:

predicting a respective minimum input speed based upon the respective input speed profile for each of the plurality of potential destination operating range states;

determining whether said respective minimum input speed violates a minimum allowed input speed; and

dissuading selection of any of the plurality of potential destination operating range states wherein the respective minimum input speed violates the minimum allowed input speed.

9. The method of claim 8, wherein determining said respective penalty cost comprises evaluating drivability impacts of said respective minimum input speed.

10. The method of claim 8, wherein determining said respective penalty cost comprises evaluating fuel efficiency impacts of said respective minimum input speed.