METHOD AND APPARATUS FOR ADAPTING ENGINE OPERATION IN A HYBRID POWERTRAIN SYSTEM

• US 20090118085A1
• Filed: 10/15/2008
• 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), GM Global Technology Operations Incorporated (General Motors Company), Daimler AG (Mercedes-Benz Group AG), Chrysler LLC (Stellantis NV)
• Inventors: Heap, Anthony H.
• Granted Patent: US 8,070,647 B2
• Time in Patent Office: Days
• US Class Current: 477/5
• 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: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60W 10/02 including control of driveline 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 10/10 including control of change-speed gearings
• 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 20/15 Control strategies specially adapted for achieving a particular effect
• CPC Class Codes: B60W 2050/0006 Digital architecture hierarchy
• CPC Class Codes: B60W 2510/0241 Clutch slip, i.e. difference between input and output speeds
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2710/025 Clutch slip, i.e. difference between input and output speeds
• CPC Class Codes: B60W 2710/0666 : Engine torque
• CPC Class Codes: B60W 2710/083 : Torque
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility

Abstract

A powertrain includes an engine coupled to an input member of a hybrid transmission. The hybrid transmission is operative to transfer power between an input member and a plurality of torque machines and an output member. A method for controlling the powertrain includes, monitoring operation of the hybrid transmission, determining motor torque offsets for the torque machines, transforming the motor torque offsets for the torque machines to an input torque offset and an output torque offset of the hybrid transmission, and adjusting operation of the engine based upon the input torque offset and the output torque offset of the hybrid transmission.

Claims

1. Method for controlling a powertrain comprising an engine coupled to an input member of a hybrid transmission, the hybrid transmission operative to transfer power between an input member and a plurality of torque machines and an output member, the method comprising:

monitoring operation of the hybrid transmission;

determining motor torque offsets for the torque machines;

transforming the motor torque offsets for the torque machines to an input torque offset and an output torque offset of the hybrid transmission; and

adjusting operation of the engine based upon the input torque offset and the output torque offset of the hybrid transmission.

2. The method of claim 1, further comprising determining the motor torque offsets for the torque machines based upon an input speed error of the input member when operating the hybrid transmission in a continuously variable operating range state.

3. The method of claim 1, further comprising determining the motor torque offsets for the torque machines based upon an input speed error of the input member and a clutch slip speed error when operating the hybrid transmission in a neutral mode.

4. The method of claim 1, comprising adjusting engine operation based upon the input torque offset and the output torque offset of the hybrid transmission.

5. The method of claim 4, further comprising adjusting a preferred input torque from the engine to the input member based upon the input torque offset and the output torque offset of the hybrid transmission.

6. The method of claim 5, further comprising adjusting a preferred engine state based upon the input torque offset and the output torque offset of the hybrid transmission.

7. The method of claim 1, comprising adjusting input torque constraints to the hybrid transmission based upon the input torque offset and the output torque offset of the hybrid transmission.

8. The method of claim 1, further comprising:

determining an input speed error of the input member based upon a measured input speed and an input speed profile;

determining the motor torque offsets for the torque machines based upon the input speed error;

transforming the motor torque offsets for the torque machines to an input torque offset and an output torque offset for the hybrid transmission; and

adjusting engine operation based upon the input torque offset and the output torque offset of the hybrid transmission

9. Method for controlling a powertrain system including an engine coupled to an input member of a transmission and a plurality of torque machines connected to an energy storage device, the transmission operative to transfer power between the engine and the torque machines and an output member coupled to a driveline through selective actuation of a plurality of torque transfer clutches, the method comprising:

monitoring operator inputs to an accelerator pedal and to a brake pedal;

determining an output torque request based upon the operator inputs to the accelerator pedal and to the brake pedal;

monitoring an input speed of the input member of transmission;

determining a clutch slip speed for one of the torque transfer clutches;

determining a target input speed and a target clutch slip speed;

determining motor torque offsets for the torque machines based upon a difference between the input speed and the targeted input speed and a difference between the clutch slip speed and the target clutch slip speed;

transforming the motor torque offsets for the torque generating machines to an input torque offset and a output torque offset to the transmission; and

adjusting the input torque from the engine to the transmission and selecting a preferred engine state based upon the input torque offset and the output torque offset to the transmission.

10. Method for controlling a powertrain system including a hybrid transmission operative to transfer power between an engine, torque machines, an energy storage device, and an output member, the method comprising:

determining an output torque command;

monitoring an input parameter from the engine to the transmission;

determining a target state for the input parameter from the engine;

determining motor torque offsets for the torque machines based upon a difference between the monitored state for the input parameter and the target state for the input parameter;

transforming the motor torque offsets for the torque generating machines to input and output torque offsets to the transmission;

adjusting operation of the engine based upon the input and output torque offsets to the transmission; and

controlling power flow between the engine the torque machines, the energy storage device, and the output member to achieve the output torque command based upon the adjusted operation of the engine.