METHOD FOR OPERATING A HYBRID DRIVE FOR A VEHICLE

• US 20090321166A1
• Filed: 03/09/2007
• Published: 12/31/2009
• Est. Priority Date: 03/21/2006
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Mecks, Michael, Falkenstein, Jens-Werner, Glora, Michael
• Application Number:
  US12/282,665
• Publication Number:
  US 20090321166A1
• Time in Patent Office: Days
• US Class Current: 180/65.285
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 15/2045 for optimising the use of energy
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/443 Torque
• 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 2510/106 Output power
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2530/10 Weight
• CPC Class Codes: B60W 2530/16 Driving resistance
• CPC Class Codes: B60W 50/038 Limiting the input power, torque or speed
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A method for operating a hybrid drive for a vehicle including at least one internal combustion engine and at least one electric motor, the internal combustion engine and the electric motor being operable in a hybrid mode, which enables a temporary power boost by supplementing the internal combustion engine output with electric motor output. The temporary power boost is allowed only until reaching a limit velocity (V_G), which depends on the maximum velocity (V_SM, V_SM′) in internal combustion engine mode, which depends on the particular driving resistance.

Claims

1-12. -12. (canceled)

13. A method for operating a hybrid drive for a vehicle having at least one internal combustion engine and at least one electric motor, the method comprising:

operating the internal combustion engine and the electric motor in a hybrid mode which allows a temporary power boost by supplementing internal combustion engine power with electric motor power; and

allowing the temporary power boost only until reaching a limit velocity, which depends on a maximum velocity in an internal combustion engine mode as a function of a particular driving resistance.

14. The method of claim 13, wherein a driving resistance is determined based on variables which change based on a particular driving state corresponding to output torques of the hybrid drive, vehicle acceleration, mass moments of inertia of rotating vehicle parts, and a vehicle mass.

15. The method of claim 13, wherein the maximum velocity in the internal combustion engine mode is a function of a particular charge state of at least one electrical storage device assigned to the electric motor and a resulting power demand of a generator charging the electrical storage device and a power demand of a vehicle electrical system.

16. The method of claim 13, wherein the temporary power boost is used exclusively for acceleration operations.

17. The method of claim 13, wherein the limit velocity corresponds to the particular maximum velocity in the internal combustion engine mode.

18. The method of claim 13, wherein the temporary power boost is used to temporarily increase the vehicle velocity above the maximum velocity in the internal combustion engine mode.

19. The method of claim 13, wherein the particular maximum velocity in the internal combustion engine mode is ascertained as a function of possible gear ratios of a drive transmission.

20. The method of claim 13, wherein the kinetic energy of the vehicle during braking is used to charge the electrical storage device by the generator.

21. The method of claim 13, wherein the temporary power boost is possible only up to a predefinable maximum period of time.

22. The method of claim 13, wherein the temporary power boost occurs only at a charge state of the electrical storage device above a predefined charge threshold.

23. The method of claim 13, wherein the electrical storage device includes a rechargeable battery.

24. The method of claim 13, wherein the electric motor includes a generator.