METHOD AND APPARATUS FOR SECURING OUTPUT TORQUE IN A DISTRIBUTED CONTROL MODULE SYSTEM FOR A POWERTRAIN SYSTEM

• US 20090118901A1
• Filed: 10/06/2008
• Published: 05/07/2009
• Est. Priority Date: 11/05/2007
• 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), Daimler AG (Mercedes-Benz Group AG), GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust), Chrysler LLC (Stellantis NV)
• Inventors: Cawthorne, William R., Buur, Hanne, Stanowski, Paul A.
• Granted Patent: US 8,155,815 B2
• Time in Patent Office: Days
• US Class Current: 701/35
• 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 2240/423 Torque
• CPC Class Codes: B60L 2240/443 Torque
• 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 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/15 Control strategies specially adapted for achieving a particular effect
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2510/083 Torque
• CPC Class Codes: B60W 2510/1025 Input torque
• CPC Class Codes: B60W 2510/105 Output torque
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2556/10 Historical data
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/083 : Torque
• CPC Class Codes: B60W 2710/1022 : Input torque
• CPC Class Codes: B60W 50/04 : Monitoring the functioning of the control system
• 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 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 to monitor integrity of a motor torque command for a transmission in a hybrid powertrain system includes calculating motor torque commands for the torque generating machines. Torque corrections for the motor torque commands are determined. The motor torque commands are adjusted based upon the torque corrections. The adjusted motor torque commands are verified based upon an estimated output torque.

Claims

1. Method to monitor signal integrity in a control module for a hybrid powertrain system including a transmission and a plurality of torque generating machines connected to an energy storage device, the transmission operative to transfer power between an input member and the torque generating machines and an output member, the method comprising:

determining an output torque command;

calculating motor torque commands for the torque generating machines based upon the output torque command;

determining torque corrections for the motor torque commands;

adjusting the motor torque commands based upon the torque corrections for the motor torque commands;

determining an input torque correction based upon the torque corrections for the motor torque commands;

determining an actual input torque to the input member;

estimating an output torque based upon the actual input torque, the input torque correction, and the adjusted motor torque commands; and

comparing the estimated output torque and the output torque command.

2. The method of claim 1, further comprising verifying integrity of the torque corrections for the motor torque commands prior to adjusting the motor torque commands based upon the torque corrections for the motor torque commands.

3. The method of claim 2, wherein verifying integrity of the torque corrections comprises redundantly storing the torque corrections at first and second memory locations in a memory device of the control module.

4. The method of claim 3, further comprising comparing data stored at the first and second memory locations in the memory device of the control module.

5. The method of claim 1, wherein the torque corrections for the motor torque commands comprise closed loop torque corrections based upon output speed.

6. The method of claim 5, wherein the torque corrections for the motor torque commands further comprise torque corrections for actively damping driveline pulsations.

7. The method of claim 5, wherein the torque corrections for the motor torque commands further comprise torque corrections for engine pulse cancellation.

8. A method to monitor integrity of a signal in a distributed control module system operative to control an electromechanical transmission, the transmission operative to transfer power between an input member and a plurality of torque generating machines and an output member, the method comprising:

calculating motor torque commands for the torque generating machines based upon an output torque command;

determining torque corrections for the motor torque commands;

adjusting the motor torque commands based upon the torque corrections for the motor torque commands;

determining an input torque correction based upon the torque corrections for the motor torque commands;

determining an actual input torque to the input member;

estimating an output torque based upon the actual input torque and the adjusted motor torque commands;

adjusting the estimated output torque based upon the input torque correction; and

comparing the estimated output torque and the output torque command.

9. A method to monitor integrity of a motor torque command in a distributed control module system operative to control an electro-mechanical transmission, the transmission operative to transfer power between an input member and a plurality of torque generating machines and an output member, the method comprising:

calculating motor torque commands for the torque generating machines based upon an output torque command;

determining torque corrections for the motor torque commands;

adjusting the motor torque commands based upon the torque corrections for the motor torque commands;

determining an input torque correction based upon the torque corrections for the motor torque commands;

estimating an output torque based upon an actual input torque, the input torque correction, and the adjusted motor torque commands;

verifying the adjusted motor torque commands based upon the output torque command and the estimated output torque.

10. The method of claim 9, wherein verifying the adjusted motor torque commands comprises adjusting the estimated output torque based upon the input torque correction and comparing the adjusted estimated output torque and the output torque command.

11. The method of claim 9, further comprising securing integrity of the adjusted motor torque commands for the torque generating machines by comparing data stored at first and second memory locations in a memory device for each of the torque generating machines and then redundantly storing the adjusted motor torque commands at the first and the second memory locations.

12. A method to monitor integrity of a motor torque command in a distributed control module system operative to control a powertrain system including an electromechanical transmission, the transmission operative to transfer power between an input member and a plurality of torque generating devices and an output member, the method comprising:

determining an input torque;

executing a first algorithm to determine motor torque commands for the torque generating devices based upon the input torque and an output torque command;

determining torque corrections for the motor torque commands for the torque generating devices based upon autonomic operation of the powertrain system;

determining adjusted motor commands for each of the torque generating devices based upon the torque corrections;

determining an input torque correction based upon the torque corrections for the torque generating devices; and

executing a second algorithm to estimate an output torque based upon the input torque, the input torque correction and the adjusted commands for each of the torque generating devices.

13. The method of claim 12, comprising comparing the output torque command and the estimated output torque.

14. The method of claim 12, comprising operating the torque generating devices based upon the adjusted commands for the torque generating devices.