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

• US 20030140630A1
• Filed: 01/31/2003
• Published: 07/31/2003
• Est. Priority Date: 01/31/2002
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Baeuerle, Michael, Porten, Guido, Reisinger, Carsten
• Granted Patent: US 6,928,819 B2
• Time in Patent Office: Days
• 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); and

,

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.

2. The method of claim 1, comprising the step of using the charge pressure (plezv) of said electric auxiliary charger as said characteristic quantity.

3. The method of claim 2, 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. The method of claim 1, wherein a regenerative feedback of said electric auxiliary charger on a pressure ratio of said exhaust-gas turbocharger is considered.

7. The method of claim 6, wherein a corrected charge pressure of said electric auxiliary charger, which considers the regenerative feedback effect, is determined by multiplying a regenerative feedback factor (MF) by said charge pressure (plezv) of said electric auxiliary charger.

8. The method of claim 6, wherein a corrected compressor pressure ratio (vpezvk) of said electric auxiliary charger is determined by multiplying a regenerative feedback factor (MF) by said compressor pressure ratio (vpezv) of said electric auxiliary charger;

and, said compressor pressure ratio (vpezvk) considers the regenerative feedback effect.

9. The method of claim 8, wherein said compressor pressure ratio (vpezvk) is limited to the pressure increase of said electric auxiliary charger.

10. The method of claim 8, wherein said regenerative feedback factor (MF) is adapted to the particular operating point of said electric auxiliary charger and said exhaust-gas turbocharger.

11. The method of claim 10, wherein said regenerative feedback factor (MF) is adapted utilizing a characteristic field.

12. The method of claim 2, 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.

13. The method of claim 1, wherein said compressor pressure ratio (vpezv) of said electric auxiliary charger is used as said characteristic quantity.

14. The method of claim 13, wherein an input quantity of the control is corrected with said compressor pressure ratio (vpezv) of said electric auxiliary charger.

15. The method of claim 14, wherein said charge pressure actual value (pvdkds) is corrected by division of said compressor pressure ratio (vpezv) of said electric auxiliary charger.

16. The method of claim 14, wherein said charge pressure desired value (plsoll) is corrected by multiplication of said compressor pressure ratio (vpezv) of said electric auxiliary charger.

17. The method of claim 1, wherein a bypass, which is connected in parallel with the turbine of said exhaust-gas turbocharger, is closed as long as said electric auxiliary charger is activated.

18. The method of claim 1, wherein an input quantity of the control is corrected by said characteristic quantity of said electric auxiliary charger.

19. An arrangement for controlling the charge pressure of an exhaust-gas turbocharger, the arrangement comprising:

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

,

means for 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.