Control system and method for estimating turbocharger performance

• US 20070227139A1
• Filed: 03/30/2006
• Published: 10/04/2007
• Est. Priority Date: 03/30/2006
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Dea, Kevin, Withrow, Michael, Gehrke, Christopher, Donoho, Michael
• Granted Patent: US 7,296,562 B2
• Time in Patent Office: Days
• US Class Current: 60/599
• CPC Class Codes: F01N 11/002 the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
• CPC Class Codes: F02B 29/0406 Layout of the intake air cooling or coolant circuit
• CPC Class Codes: F02B 39/16 Other safety measures for, or other control of, pumps
• CPC Class Codes: F02D 2041/001 for engines with variable valve actuation
• CPC Class Codes: F02D 2200/0406 Intake manifold pressure
• CPC Class Codes: F02D 2200/0408 Estimation of intake manifold pressure
• CPC Class Codes: F02D 2200/0414 Air temperature
• CPC Class Codes: F02D 2200/703 Atmospheric pressure
• 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: F02D 41/0072 Estimating, calculating or determining the EGR rate, amount or flow sensors in EGR systems F02M26/45
• CPC Class Codes: F02M 26/06 Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
• CPC Class Codes: F02M 26/23 Layout, e.g. schematics
• CPC Class Codes: F02M 26/35 with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
• CPC Class Codes: F02M 26/36 with means for adding fluids other than exhaust gas to the recirculation passage; with reformers
• CPC Class Codes: F02M 26/47 the characteristics being temperatures, pressures or flow rates
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A control system for estimating the performance of a compressor is disclosed. The control system has a compressor fluidly connected to an inlet manifold of a power source. The control system also has a power source speed sensor to provide an indication of a rotational speed of the power source, an inlet pressure sensor to provide an indication of a pressure of a fluid within the inlet manifold, an inlet temperature sensor to provide an indication of a temperature of the fluid within the inlet manifold, an atmospheric pressure sensor to provide an indication of an atmospheric pressure, and a control module in communication with each of the sensors. The control module is configured to monitor an engine valve opening duration and an exhaust gas recirculation valve position, and estimate a compressor inlet pressure based on the provided indications, the monitored duration, and the monitored position.

Claims

1. A control system for estimating performance of a compressor, comprising:

a compressor fluidly connected to an inlet manifold of a power source and being configured to receive a mixed flow of air and exhaust;

a power source speed sensor associated with an output of the power source and being configured to provide an indication of a rotational speed of the power source;

an inlet pressure sensor associated with the inlet manifold and being configured to provide an indication of a pressure of a fluid within the inlet manifold;

an inlet temperature sensor associated with the inlet manifold of the power source and being configured to provide an indication of a temperature of the fluid within the inlet manifold;

an atmospheric pressure sensor configured to provide an indication of an atmospheric pressure; and

a control module in communication with the power source speed sensor, inlet pressure sensor, inlet temperature sensor, and atmospheric pressure sensor, the control module being configured to;

monitor;

an engine valve opening duration; and

an exhaust gas recirculation valve position; and

estimate a compressor inlet pressure based on the provided indications, the monitored engine valve opening duration, and the monitored exhaust gas recirculation valve position.

2. The control system of claim 1, further including:

an exhaust gas pressure sensor configured to provide an indication of an exhaust gas pressure; and

an exhaust gas temperature sensor configured to provide an indication of an exhaust gas temperature, wherein the control module is further configured to determine an exhaust gas density based on the provided indications of exhaust gas pressure and temperature.

3. The control system of claim 2, further including an exhaust gas differential pressure sensor configured to provide an indication of an exhaust gas differential pressure associated with an exhaust venturi, wherein the control module is further configured estimate an exhaust gas recirculation mass air flow value based on the provided indication of exhaust gas differential pressure and the determined exhaust gas density.

4. The control system of claim 3, further including an atmospheric temperature sensor configured to provide an indication of an atmospheric temperature, wherein the control module is further configured to:

estimate a total mass air flow of fluid through the compressor based on;

the monitored engine valve opening duration;

the provided indication of a rotational speed of the power source;

the provided indication of a pressure of a fluid within the inlet manifold; and

the provided indication of a temperature of the fluid within the inlet manifold; and

estimate a compressor inlet temperature based on;

the estimated total mass air flow;

the provided indication of an atmospheric temperature;

the estimated exhaust gas recirculation mass air flow; and

the provided indication of an exhaust gas temperature.

5. The control system of claim 4, wherein the control module is further configured to estimate a compressor outlet pressure based on:

the estimated total mass air flow; and

the provided indication of a pressure of a fluid within the inlet manifold.

6. The control system of claim 5, wherein the control module is further configured to estimate a compressor efficiency based on:

the estimated total mass air flow;

the estimated compressor outlet pressure; and

the estimated compressor inlet pressure.

7. The control system of claim 5, further including a compressor speed sensor configured to provide an indication of a rotational speed of the compressor, wherein the control module is further configured to estimate a compressor efficiency based on:

the estimated compressor outlet pressure;

the estimated compressor inlet pressure; and

the provided indication of a rotational speed of the compressor.

8. The control system of claim 4, further including a compressor speed sensor configured to provide an indication of a rotational speed of the compressor, wherein the control module is further configured to estimate a compressor efficiency based on:

the estimated total mass air flow; and

the provided indication of a rotational speed of the compressor.

9. A method of estimating performance of a compressor, comprising:

receiving an indication of a rotational speed of the power source;

receiving an indication of a pressure of a fluid within the inlet manifold;

receiving an indication of a temperature of the fluid within the inlet manifold;

receiving an indication of an atmospheric pressure;

receiving an indication of an engine valve opening duration;

receiving an indication of an exhaust gas recirculation valve position; and

estimating a compressor inlet pressure based on the received indications.

10. The method of claim 9, further including:

receiving an indication of an exhaust gas pressure;

receiving an indication of an exhaust gas temperature; and

determining an exhaust gas density based on the received indications of exhaust gas pressure and temperature.

11. The method of claim 10, further including:

receiving an indication of an exhaust gas differential pressure associated with an exhaust venturi; and

estimating an exhaust gas recirculation mass air flow value based on the received indication of exhaust gas differential pressure and the determined exhaust gas density.

12. The method of claim 11, further including:

receiving an indication of an atmospheric temperature;

estimating a total mass air flow of fluid through the compressor based on;

the received indication of an engine valve opening duration;

the received indication of a rotational speed of the power source;

the received indication of a pressure of a fluid within the inlet manifold; and

the provided indication of a temperature of the fluid within the inlet manifold; and

estimating a compressor inlet temperature based on;

the estimated total mass air flow;

the received indication of an atmospheric temperature;

the estimated exhaust gas recirculation mass air flow; and

the received indication of an exhaust gas temperature.

13. The method of claim 12, further including estimating a compressor outlet pressure based on:

the total mass air flow; and

the received indication of a pressure of a fluid within the inlet manifold.

14. The method of claim 13, further including estimating a compressor efficiency based on:

the estimated total mass air flow;

the estimated compressor outlet pressure; and

the estimated compressor inlet pressure.

15. The method of claim 13, further including:

receiving an indication of a rotational speed of the compressor; and

estimating a compressor efficiency based on;

the estimated compressor outlet pressure;

the estimated compressor inlet pressure; and

the received indication of a rotational speed of the compressor.

16. The method of claim 12, further including:

receiving an indication of a rotational speed of the compressor; and

estimating a compressor efficiency based on;

the estimated total mass air flow; and

the received indication of a rotational speed of the compressor.

17. A machine, comprising:

an engine having variable engine valve timing and an inlet manifold;

an air induction system having a compressor configured to supply compressed air through the inlet manifold to the engine;

an exhaust recirculation system having a recirculation valve configured to meter exhaust gas to the compressor;

an engine speed sensor associated configured to provide an indication of a rotational speed of the engine;

an inlet manifold pressure sensor configured to provide an indication of a pressure of a fluid within the inlet manifold;

an inlet manifold temperature sensor configured to provide an indication of a temperature of the fluid within the inlet manifold;

an atmospheric pressure sensor configured to provide an indication of an atmospheric pressure; and

a control module in communication with the inlet manifold pressure, inlet manifold temperature, and atmospheric pressure sensors, the control module being configured to;

monitor;

an engine valve opening duration; and

a position of the recirculation valve; and

estimate a compressor inlet pressure based on the provided indications, monitored engine valve opening duration, and monitored recirculation valve position.

18. The machine of claim 17, further including:

an exhaust gas pressure sensor configured to provide an indication of an exhaust gas pressure;

an exhaust gas temperature sensor configured to provide an indication of an exhaust gas temperature; and

an exhaust gas differential pressure sensor configured to provide an indication of an exhaust gas differential pressure associated with an exhaust venturi, wherein the control module is further configured to;

determine an exhaust gas density based on the provided indications of exhaust gas pressure and temperature; and

estimate an exhaust gas recirculation mass air flow value based on the provided indication of exhaust gas differential pressure and the determined exhaust gas density.

19. The machine of claim 18, further including an atmospheric temperature sensor configured to provide an indication of an atmospheric temperature, wherein the control module is further configured to:

estimate a total mass air flow of fluid through the compressor based on;

the monitored engine valve opening duration;

the provided indication of a rotational speed of the power source;

the provided indication of a pressure of a fluid within the inlet manifold; and

the provided indication of a temperature of the fluid within the inlet manifold; and

estimate a compressor inlet temperature based on;

the estimated total mass air flow;

the provided indication of an atmospheric temperature;

the estimated exhaust gas recirculation mass air flow; and

the provided indication of an exhaust gas temperature.

20. The machine of claim 19, wherein the control module is further configured to:

estimate a compressor outlet pressure based on;

the total mass air flow; and

the indication of a pressure of a fluid within the inlet manifold; and

estimate a compressor efficiency based on;

the estimated total mass air flow;

the estimated compressor outlet pressure; and

the estimated compressor inlet pressure.

21. The machine of claim 20, further including a compressor speed sensor configured to provide an indication of a rotational speed of the compressor, wherein the control module is further configured to:

estimate a compressor efficiency based on;

the estimated compressor outlet pressure;

the estimated compressor inlet pressure; and

the provided indication of a rotational speed of the compressor; and

estimate a compressor efficiency based on;

the estimated total mass air flow; and

the provided indication of a rotational speed of the compressor.