Method of and apparatus for operating a drive train with an electrical machine

• US 7,584,607 B2
• Filed: 01/25/2006
• Issued: 09/08/2009
• Est. Priority Date: 01/26/2005
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Schueler, Matthias, Fehrmann, Ruediger, Samuelsen, Dirk
• Primary Examiner(s): Tran; Binh Q
• Application Number:
  US11/338,840
• Publication Number:
  US 20060162322A1
• Time in Patent Office: 1,322 Days
• Field of Search: 602/74, 602/84, 602/85, 602/95, 602/97, 603/00, 603/03, 603/11, 602/80, 602/86, 180/165, 180/65.2, 180/65.3, 180/65.4, 180/65.5
• US Class Current: 60/295
• CPC Class Codes: B60K 6/26 characterised by the motors or the generators
• CPC Class Codes: B60K 6/48 Parallel type
• 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 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 20/15 Control strategies specially adapted for achieving a particular effect
• CPC Class Codes: B60W 20/16 for reducing engine exhaust emissions
• CPC Class Codes: B60W 20/19 for achieving enhanced acceleration
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60Y 2300/476 Regeneration of particle filters
• CPC Class Codes: F01N 11/00 Monitoring or diagnostic devices for exhaust-gas treatment apparatus , e.g. for catalytic activity safety, indicating or supervising devices for internal combustion engines F02B77/08; testing of machines G01M13/00
• CPC Class Codes: F01N 3/023 using means for regenerating the filters, e.g. by burning trapped particles by electrically controlling the supply of combustible mixture or its constituents only F02D41/0235
• CPC Class Codes: F01N 3/0842 Nitrogen oxides
• CPC Class Codes: F02D 2250/24 by using an external load, e.g. a generator
• CPC Class Codes: F02D 41/0275 the exhaust gas treating apparatus being a NOx trap or adsorbent
• CPC Class Codes: F02N 11/04 the motors being associated with current generators
• CPC Class Codes: Y02T 10/40 Engine management systems
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

The invention is based on a method for operating an engine drive train having a connectable electrical machine, the electrical machine being drivingly connectable to the engine in whose exhaust gas system an exhaust gas cleaning device is located. A moment output of or drawn by the electrical machine is impressed on a moment of the engine that is demanded by an engine control unit, as a function of an operating state of the exhaust gas cleaning device.

Claims

1. In a method for operating an engine drive train having a connectable electrical machine, the electrical machine being drivingly connectable to the engine in whose exhaust gas system an exhaust gas cleaning device is located, the method comprising the steps of outputting or drawing a moment by the electrical machine as a function of an operating state of the exhaust gas cleaning device, impressing the electrical machine moment on a moment of the engine that is demanded by an engine control unit, combining the electrical machine moment with the engine moment resulting in a driver moment for the drive train, and then during a regeneration phase of the exhaust gas cleaning device increasing the temperature of the exhaust gas by maintaining the driver moment and drawing moment by the electrical machine, thereby having a positive effect on the engine emissions and efficiency, and deriving an optimized engine moment from a desired moment demanded by a driver, during a storage phase of nitrogen oxides into the exhaust gas cleaning device, drawing or outputting moment by the electrical machine as a function of a bandwidth around the desired moment, and optimizing a target function dependent at least on the engine efficiency, on the crude NOx emissions and on the NOx storage rate, by specification of the engine moment.

2. The method in accordance with claim 1, wherein the optimized engine moment is fed into a moment path of an engine control unit of the engine.

3. The method in accordance with claim 1, wherein in a regeneration phase of the exhaust gas cleaning device, the electrical machine draws an increased moment, and the engine is subjected to a load that is increased by the amount of the increased moment.

4. The method in accordance with claim 2, wherein in a regeneration phase of the exhaust gas cleaning device, the electrical machine draws an increased moment, and the engine is subjected to a load that is increased by the amount of the increased moment.

5. The method in accordance with claim 3, wherein the electrical machine draws its maximum moment.

6. The method in accordance with claim 3, further comprising the step of regenerating a storage-type catalytic converter.

7. The method in accordance with claim 5, further comprising the step of regenerating a storage-type catalytic converter.

8. The method in accordance with claim 3, wherein a Diesel particle filter is regenerated.

9. An apparatus for performing a method in accordance claim 1, wherein at least one engine control unit, set up for performing the method, is provided.