Emissions sensors for fuel control in engines

• US 7,878,178 B2
• Filed: 06/23/2008
• Issued: 02/01/2011
• Est. Priority Date: 08/18/2005
• Status: Active Grant

• Current Assignee: Garrett Transportation I Inc. (Garrett Motion, Inc.)
• Original Assignee: Honeywell International Inc.
• Inventors: Stewart, Gregory E., Rhodes, Michael L.
• Primary Examiner(s): Huynh; Hai H
• Application Number:
  US12/144,445
• Publication Number:
  US 20080249697A1
• Time in Patent Office: 953 Days
• Field of Search: 123/436, 123/672, 123/691, 123/480, 123/703, 701103-105, 701109-110, 60285-286
• US Class Current: 123/436
• CPC Class Codes: F02D 2041/1412 using a predictive controller
• CPC Class Codes: F02D 2041/1415 using a state feedback or a state space representation
• CPC Class Codes: F02D 2041/1416 Observer
• CPC Class Codes: F02D 2041/1433 using a model or simulation of the system
• CPC Class Codes: F02D 31/007 controlling fuel supply
• CPC Class Codes: F02D 41/1401 characterised by the control or regulation method F02D41/1473, F02D41/1477 take precedence
• CPC Class Codes: F02D 41/1406 with use of a optimisation method, e.g. iteration
• CPC Class Codes: F02D 41/146 the characteristics being an NOx content or concentration
• CPC Class Codes: F02D 41/1467 with determination means using an estimation
• CPC Class Codes: F02D 41/402 Multiple injections

Abstract

A system for controlling fuel to an engine to minimize emissions in an exhaust of the engine. There may be a controller connected to an actuator, for example a fuel control actuator, of the engine and to emissions sensors, such as an NOx and/or PM sensor, proximate to an exhaust output of the engine. The controller, for example a speed controller, may have an input connected to an output of a pedal or desired speed setting mechanism. A speed sensor at a power output of the engine may be connected to an input of the controller.

Claims

1. A control system for an engine of a driven vehicle, comprising:

one or more actuators for controlling one or more inputs to an engine;

at least one engine emission sensor, each of the at least one engine emission sensors for sensing an emission parameter, wherein the at least one emissions sensors detect NOx and PM;

a controller coupled to the one or more actuators and the at least one engine emission sensor, the controller including a multi-parameter model that models the effects of changes in the one or more actuators on each of two or more engine operating parameters based on the sensed emission parameters while the vehicle is being driven by a user; and

wherein the controller is configured to adjust at least one actuator of the engine and make a change to one or more inputs to the engine in order to produce a controlled change in each of the two or more engine operating parameters as modeled by the multi-parameter model while the vehicle is being driven by a user.

2. The control system of claim 1 wherein the multi-parameter model models the effects of changes in the one or more actuators on each of two or more engine operating parameters including at least one emission parameter.

3. The control system of claim 1, wherein the controller is a fuel controller.

4. The control system of claim 3, wherein the fuel controller is configured to adjust at least one actuator of the engine and make a change to one or more inputs to the engine in order to produce a controlled change in each of the two or more engine operating parameters as modeled by the multi-parameter model including the at least one emission parameter.

5. The control system of claim 4, further comprising:

a speed sensor connected to the controller for sensing the speed of the engine; and

at least one of the actuators for controlling the speed of the engine.

6. The control system of claim 1, wherein the controller adjust at least one actuator of the engine to produce a controlled change in each of the amounts of NOx and PM emissions for a sensed engine speed.

7. The control system of claim 1, wherein the controller comprises one or more dynamic matrix control loops.

8. The control system of claim 1, wherein the controller comprises one or more statistical processes control loops.

9. The control system of claim 1, wherein the controller comprises a knowledge-based expert system.

10. The control system of claim 1, wherein the controller comprises a neural network.

11. The control system of claim 1, wherein the controller comprises fuzzy logic.

15. The engine control system of claim 2, wherein the multi-parameter model comprises a look-up table.

16. The engine control system of claim 15, wherein the look-up table is computed using a multi-parametric hybrid algorithm.

12. An engine control system for a driven vehicle, comprising:

one or more actuators for controlling one or more inputs to an engine;

a vehicle controller coupled to one or more of the actuators, the vehicle controller controlling the fuel profile that is delivered to the engine while the vehicle is being driven by a user;

an emissions sensor connected to the vehicle controller, the emission sensor for sensing an emission parameter of the engine, wherein the emission sensor includes a NOx sensor;

wherein the vehicle controller includes a multi-parameter model that models the effects of changes in the one or more actuators on each of two or more engine operating parameters including the emission parameter; and

wherein the vehicle controller is configured to adjust at least one actuator of the engine, including a fuel actuator, in order to produce a controlled change in each of the two or more engine operating parameters including the emission parameter, as modeled by the multi-parameter model, while the vehicle is being driven by the user.

13. The engine control system of claim 12 wherein the multi-parameter model includes one or more predictive control loops.

14. The engine control system of claim 13, wherein the one or more predictive control loops are constrained.

17. The engine control system of claim 12, wherein the multi-parameter model comprises one or more emission control constraints which are time-varying.

18. The engine control system of claim 12, wherein the multi-parameter model comprises one or more proportional-integral-derivative (PID) control loops.

19. The engine control system of claim 12, further comprising a second emissions sensor connected to the vehicle controller, the second emission sensor for sensing a second emission parameter of the engine, wherein the second emission sensor is a PM sensor.

20. An emissions control system for a diesel engine of a driven vehicle, the emission control system comprising:

a fuel controller configured to provide on-line fuel control of the diesel engine during engine operation while the vehicle is being driven by a user; and

two or more emissions sensors connected to the fuel controller, wherein a first emission sensor is a PM sensor situated in an exhaust system of the engine; and

wherein the fuel controller is configured to at least partially adjust at least one parameter of an engine in accordance with signals from the two or more emissions sensors, wherein the fuel controller comprises one or more predictive control loops.

21. The emissions control system of claim 20 wherein a second emission sensor is a NOx sensor.

22. A control system for an engine of a driven vehicle, comprising:

one or more actuators for controlling one or more inputs to an engine;

at least two engine sensors, each of the at least two engine sensors for sensing a sensed engine parameter;

a controller coupled to the one or more actuators and the at least two engine sensors, the controller including a multi-parameter model that models the effects of changes in the one or more actuators on each of the at least two sensed engine parameters; and

wherein the controller is configured to adjust at least one actuator of the engine such that a performance index is optimized while the vehicle is being driven by a user, the performance index including terms that are related to the at least two sensed engine parameters.