Method and arrangement for controlling the charge pressure of an exhaust-gas turbocharger

• US 6,928,819 B2
• Filed: 01/31/2003
• Issued: 08/16/2005
• Est. Priority Date: 01/31/2002
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Baeuerle, Michael, Porten, Guido, Reisinger, Carsten
• Primary Examiner(s): Richter, Sheldon J
• Application Number:
  US10/355,054
• Publication Number:
  US 20030140630A1
• Time in Patent Office: 928 Days
• Field of Search: 606/12, 606/00, 606/02, 606/07, 606/08, 606/09, 123/562
• US Class Current: 60/612
• CPC Class Codes: F02B 33/32 Engines with pumps other than of reciprocating-piston type with crankcase pumps F02B33/02
• CPC Class Codes: F02B 37/04 Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
• CPC Class Codes: F02B 37/12 Control of the pumps
• CPC Class Codes: F02B 37/18 by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
• CPC Class Codes: F02B 37/225 air passages
• CPC Class Codes: F02B 39/10 electric
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

The invention is directed to a method and an arrangement for controlling the charging pressure of an exhaust-gas turbocharger (1) wherein a charging pressure actual value (pvdkds) is tracked to a charging pressure desired value (plsoll). The charging pressure of the exhaust-gas turbocharger (1) is controlled in dependence upon a characteristic variable of an electric auxiliary charger (5). The electric auxiliary charger (5) coacts with the exhaust-gas turbocharger (1) for compressing the inducted air. In this way, an unnecessary opening of a bypass valve of the exhaust-gas turbocharger (1) is avoided.

Claims

1. A method for controlling the charge pressure of an exhaust-gas turbocharger, the method comprising the steps of:

causing a charge pressure actual value (pvdkds) to track a charge pressure desired value (plsoll);

controlling the charge pressure of said exhaust-gas turbocharger in dependence upon a characteristic quantity of an electric auxiliary charger coacting with said exhaust-gas turbocharger to compress the inducted air; and

,

using the charge pressure (plezv) of said electric auxiliary charger as said characteristic quantity.

2. The method of claim 1, wherein said electric auxiliary charger is switched off when said charge pressure desired value (plsoll) is exceeded by said charge pressure actual value (platl);

and, said charge pressure actual value (platl) is modified by said charge pressure (plezv) of said electric auxiliary charger.

3. The method of claim 1, wherein an input quantity of the control is corrected by the charge pressure (plezv) of said electric auxiliary charger.

4. The method of claim 3, wherein said charge pressure actual value (pvdkds) is corrected by subtracting said charge pressure (plezv).

5. The method of claim 3, wherein said charge pressure desired value (plsoll) is corrected by adding said charge pressure (plezv) of said electric auxiliary charger.

6. A method for controlling the charge pressure of an exhaust-gas turbocharger, the method comprising the steps of:

causing a charge pressure actual value (pvdkds) to track a charge pressure desired value (plsoll);

controlling the charge pressure of said exhaust-gas turbocharger in dependence upon a characteristic quantity of an electric auxiliary charger coacting with said exhaust-gas turbocharger to compress the inducted air; and

,

using said compressor pressure ratio (vpezv) of said electric auxiliary charger as said characteristic quantity.

7. The method of claim 6, wherein an input quantity of the control is corrected with said compressor pressure ratio (vpezv) of said electric auxiliary charger.

8. The method of claim 7, wherein said charge pressure actual value (pvdkds) is corrected by division of said compressor pressure ratio (vpezv) of said electric auxiliary charger.

9. The method of claim 7, wherein said charge pressure desired value (plsoll) is corrected by multiplication of said compressor pressure ratio (vpezv) of said electric auxiliary charger.

10. A method for controlling the charge pressure of an exhaust-gas turbocharger, the method comprising the steps of:

causing a charge pressure actual value (pvdkds) to track a charge pressure desired value (plsoll);

controlling the charge pressure of said exhaust-gas turbocharger in dependence upon a characteristic quantity of an electric auxiliary charger coacting with said exhaust-gas turbocharger to compress the inducted air; and

,

closing a bypass, which is connected in parallel with the turbine of said exhaust-gas turbocharger, as long as said electric auxiliary charger is activated.