Method for simplifying torque monitoring, in particular for hybrid drives

• US 9,815,448 B2
• Filed: 12/20/2006
• Issued: 11/14/2017
• Est. Priority Date: 12/29/2005
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Seel, Andreas, Niemann, Holger, Kaefer, Oliver, Hagman, Per
• Primary Examiner(s): Dolak, James M
• Application Number:
  US12/086,411
• Publication Number:
  US 20090305842A1
• Time in Patent Office: 3,982 Days
• Field of Search: 180 65265, 180 65275, 180 65285, 701 22, 701 51, 477 3, 475 2, 475 53
• 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: B60L 2240/443 Torque
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60L 2250/26 by pedal actuation
• CPC Class Codes: B60L 50/13 using AC generators and AC motors
• 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 2710/105 Output torque
• CPC Class Codes: G05D 17/02 characterised by the use of electric means
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

In a method for controlling a vehicle drive unit having at least two individual drives and a vehicle control unit, a continuous torque comparison between a permissible torque M_Zul and a further torque is performed by the control unit. The permissible torque M_Zul is continuously compared to setpoint torques M_setpoint,V and M_setpoint,E for the least two individual drives.

Claims

1. A method for torque monitoring of a vehicle drive unit having at least a first drive and a second drive, comprising:

ascertaining respective maximum permissible torques for each of the first and second drives in a calculation stage of a control unit;

performing a continuous torque comparison in a comparison stage of the control unit (i) between a setpoint torque for the first drive and the ascertained maximum permissible torque for the first drive, and (ii) between a setpoint torque for the second drive and the ascertained maximum permissible torque for the second drive.

2. The method as recited in claim 1, further comprising:

ascertaining a summed permissible torque for a combination of the first and second drives in the calculation stage; and

ascertaining a summed setpoint torque for a combination of the first and second drives.

3. The method as recited in claim 2, wherein the summed setpoint torque for the combination of the first and second drives is compared to the summed permissible torque for the combination of the first and second drives in the comparison stage.

4. The method as recited in claim 1, wherein the first drive is an internal combustion engine and the second drive is an electric drive, and wherein the setpoint torques for the first and second drives are calculated within the vehicle control unit.

5. The method as recited in claim 1, wherein the setpoint torques for the first and second drives are calculated within the vehicle control unit in a first level which is a functional level, and wherein the setpoint torques for the first and second drives are compared to the ascertained respective permissible torques for the first and second drives in a second level which is a monitoring level.

6. The method as recited in claim 4, wherein the setpoint torques for the first and second drives calculated in the vehicle control unit are compared to respective actual torques of the first and second drives in respective control units assigned to the first and second drives.

7. The method as recited in claim 5, wherein, for the comparison to the ascertained respective permissible torques for the first and second drives, the setpoint torques for the first and second drives are obtained at tap points within the first level which is the functional level.

8. The method as recited in claim 5, wherein the setpoint torques for the first and second drives are transmitted to the comparison stage for continuous torque monitoring, wherein the comparison stage is provided in the second level which is the monitoring level.