Method for controlling the operating response of a hybrid drive of a vehicle

• US 20040084231A1
• Filed: 12/16/2003
• Published: 05/06/2004
• Est. Priority Date: 11/24/2001
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Hoetzer, Dieter, Loeffler, Juergen
• Granted Patent: US 7,174,980 B2
• Time in Patent Office: Days
• US Class Current: 180/65.2
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2240/423 Torque
• 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 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• 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 2710/083 Torque
• 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
• CPC Class Codes: Y10S 903/945 Characterized by control of gearing, e.g. control of transmission ratio
• CPC Class Codes: Y10S 903/946 Characterized by control of driveline clutch

Abstract

A method of controlling the operating response of a hybrid drive of a vehicle is described, the hybrid drive having an internal combustion engine and at least one electric motor as the drive motors, and the drive shafts of the drive motors being mechanically linkable to a drive train of the vehicle.

A drag torque characteristic curve (52) for the hybrid drive (14) is established by targeted activation of the at least one electric motor (20, 22).

Claims

1. A method for controlling the operating response of a hybrid drive of a vehicle, the hybrid drive comprising an internal combustion engine and at least one electric motor as the drive motors, and the drive shafts of the drive motors being operatively connectible to a drive train of the vehicle,

wherein a drag torque characteristic curve (52) for the hybrid drive (14) is established by targeted activation of the at least one electric motor (20, 22).

2. The method as recited in claim 1,

wherein drag torques may be applied solely by the at least one electric motor (20, 22) by disengaging the internal combustion engine (16) from the drive train (18).

3. The method as recited in one of the preceding claims,

wherein a so-called coasting operation of the hybrid drive (14) is achieved without disengaging the internal combustion engine (16) from the drive train (18).

4. The method as recited in one of the preceding claims,

wherein the continuous drag torque characteristic curve (52) is maximally matched to a maximum possible drag torque characteristic curve (50).

5. The method as recited in one of the preceding claims,

wherein the drag torque characteristic curve (52) is determined by a drag torque coordinator (36) which provides control signals (38, 40, 42) for the drive motors (16, 20, 22) from a negative torque request (34) and a gear position (signal 44).

6. The method as recited in claim 5,

wherein the control signals (38, 40, 42) are provided as a function of an instantaneous speed (v) of the vehicle.

7. The method as recited in one of the preceding claims,

wherein electric motors (20 and 22) are operated in generator mode and/or engine mode for influencing the drag torque characteristic curve (52).

8. The method as recited in one of the preceding claims,

wherein the drag torque request is picked up by monitoring the position of the gas pedal of the vehicle.

9. The method as recited in one of the preceding claims,

wherein the drag torque characteristic curve (52) is influenced as a function of additional operating parameters of the vehicle.

10. The method as recited in claim 9,

wherein the drag torque characteristic curve (52) is varied as a function of a braking request by a vehicle driver by targeted activation of the at least one electric motor (20, 22).

11. The method as recited in claim 10,

wherein the drag torque is increased in a stepwise manner.