Defined internal combustion engine operation in vehicles having a hybrid drive

• US 8,167,066 B2
• Filed: 03/22/2007
• Issued: 05/01/2012
• Est. Priority Date: 04/10/2006
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Joos, Klaus, Wehmeier, Kersten, Streib, Martin, Huber, Thomas, Schnaibel, Eberhard, Kesch, Bernd, Schenk, Rene, Tumback, Stefan, Baeuerle, Peter, Mann, Karsten
• Primary Examiner(s): Restifo, Jeffrey J
• Application Number:
  US12/296,349
• Publication Number:
  US 20090173557A1
• Time in Patent Office: 1,867 Days
• Field of Search: 180/65.28, 180/65.265, 180/65.285, 180/65.25
• US Class Current: 180/65.265
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/443 Torque
• CPC Class Codes: B60L 2260/26 Transition between different drive modes
• CPC Class Codes: B60L 2270/145 Structure borne vibrations
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• 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 20/11 using model predictive control [MPC] strategies, i.e. control methods based on models predicting performance utilising navigation and traffic information in the control strategy B60W20/12
• CPC Class Codes: B60W 2510/085 Power
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• 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

Abstract

A method for setting operating states of an internal combustion engine, in particular an internal combustion engine of a hybrid drive. In addition to the internal combustion engine, the hybrid drive includes at least one electric drive, a hybrid coordinator and a control unit assigned to the internal combustion engine in which functions are implemented. The functions request operating states favorable to their running ability from the hybrid coordinator which performs a commensurate modification of the distribution of power between the internal combustion engine and the at least one electric drive.

Claims

1. A method for setting an operating state of an internal combustion engine of a hybrid drive system, the hybrid drive system further including at least one electric drive, a hybrid coordinator, a control unit for the internal combustion engine, the control unit including multiple functions, the method comprising:

generating and transmitting, by each function, information regarding operating readiness of the respective function and associated possible operating states of the internal combustion engine in which the respective function is able to be executed;

selecting, by a scheduler of the functions, a function which has operating readiness and has the highest priority among the multiple functions; and

if at least one of the possible operating states associated with the selected function is able to be implemented by the hybrid coordinator, the hybrid coordinator performing a modification of a distribution of power between the internal combustion engine and the at least one electric drive to operate the internal combustion engine at the at least one of the possible operating states.

2. The method as recited in claim 1, wherein during the modification of the distribution of power between the internal combustion engine and the at least one electric drive, a requested transmission output torque is generated and a requested vehicle speed is maintained.

3. The method as recited in claim 1, wherein each of the functions sends its operating readiness to the scheduler via a signal at each specific possible operating point or operating range.

4. A method for setting an operating state of an internal combustion engine of a hybrid drive system, the hybrid drive system further including at least one electric drive, a hybrid coordinator, a control unit for the internal combustion engine, the control unit including multiple functions, the method comprising:

generating and transmitting, by the hybrid coordinator, information regarding possible operating states or operating ranges of the internal combustion engine to the control unit of the internal combustion engine or a scheduler of the functions;

determining, by each of the functions or by the scheduler of the functions, operating readiness of each function for the possible operating states or the possible operating ranges of the internal combustion engine;

selecting, by the scheduler of the functions, a function which has operating readiness and has the highest priority among the multiple functions, wherein the scheduler sends at least one of possible operating state and possible operating range associated with the selected function to the hybrid coordinator; and

performing, by the hybrid coordinator, a modification of a distribution of power between the internal combustion engine and the at least one electric drive to operate the internal combustion engine at the at least one of the possible operating state and the possible operating range associated with the selected function.

5. The method as recited in claim 4, wherein a maximum time duration for at least one of an operating state and an operating range, of the internal combustion engine is determined in the hybrid coordinator, the maximum time duration being sent either to the control unit for the internal combustion engine or to the scheduler of the functions.

6. The method as recited in claim 4, wherein in the event of a modification of the driving state, the hybrid coordinator adjusts the possible operating states of the internal combustion engine, and a change occurs between at least one of various operating states, thrust, idling, normal operation, engine stop, and operating points of the internal combustion engine, without changing the transmission output torque and without changing a transmission output rotational speed.