PREDICTIVE AFTERTREATMENT SCHEDULING FOR A VEHICLE

• US 20140074386A1
• Filed: 09/13/2012
• Published: 03/13/2014
• Est. Priority Date: 09/13/2012
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: McGee, Ryan Abraham, Wang, Qing, Van Nieuwstadt, Michiel J.
• Granted Patent: US 9,102,320 B2
• Time in Patent Office: Days
• US Class Current: 701/113
• CPC Class Codes: B60W 20/11 using model predictive control [MPC] strategies, i.e. control methods based on models predicting performance utilising navigation and traffic information in the control strategy B60W20/12
• CPC Class Codes: B60W 20/12 using control strategies taking into account route information estimation or calculation of non-directly measurable driving parameters B60W40/00
• CPC Class Codes: B60W 20/16 for reducing engine exhaust emissions
• CPC Class Codes: B60W 2552/20 Road profile, i.e. the change in elevation or curvature of a plurality of continuous road segments
• CPC Class Codes: B60W 2556/50 of positioning data, e.g. GPS [Global Positioning System] data
• CPC Class Codes: B60W 50/0097 Predicting future conditions
• CPC Class Codes: B60Y 2300/476 Regeneration of particle filters
• CPC Class Codes: B60Y 2400/432 Diesel Engines
• CPC Class Codes: F01N 2590/11 for hybrid vehicles
• CPC Class Codes: F01N 9/00 Electrical control of exhaust gas treating apparatus monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00
• CPC Class Codes: F01N 9/002 of filter regeneration, e.g. detection of clogging
• CPC Class Codes: F02D 2200/501 Vehicle speed
• CPC Class Codes: F02D 2200/701 Information about vehicle position, e.g. from navigation system or GPS signal
• CPC Class Codes: F02D 41/029 the exhaust gas treating apparatus being a particulate filter
• CPC Class Codes: Y02T 10/40 Engine management systems
• CPC Class Codes: Y02T 10/84 Data processing systems or methods, management, administration

Abstract

A method to control a hybrid electric vehicle includes operating a compression ignition engine based on an engine-on request, and performing an exhaust aftertreatment procedure when a fraction of an engine-on time is greater than an aftertreatment condition threshold. A vehicle has a compression ignition engine with an exhaust aftertreatment system, and a controller. The controller is configured to: (i) operate the engine based on an engine-on request, and (ii) perform an exhaust aftertreatment procedure for the vehicle when an engine-on fraction for a designated time is greater than an aftertreatment condition threshold. A computer readable medium having stored data representing instructions executable by a controller to control a vehicle includes instructions for operating the engine based on an engine-on request, and instructions for performing an exhaust aftertreatment procedure for the vehicle when an engine-on time fraction is greater than an aftertreatment condition threshold.

Claims

1. A method to control a hybrid electric vehicle having a compression ignition engine, the method comprising:

operating a compression ignition engine based on an engine-on request; and

performing an exhaust aftertreatment procedure when a fraction of an engine-on time is greater than an aftertreatment condition threshold.

2. The method of claim 1 further comprising calculating the fraction from the engine-on time during a completion time for the aftertreatment procedure.

3. The method of claim 2 further comprising determining the completion time for the aftertreatment procedure from a state of an exhaust aftertreatment system.

4. The method of claim 2 further comprising determining the engine-on time during the completion time using an engine state profile.

5. The method of claim 4 further comprising determining the engine state profile from a vehicle trip profile.

6. The method of claim 5 further comprising determining the vehicle trip profile from at least one of historical information, current vehicle information, predicted information, and geographic information.

7. The method of claim 1 further comprising measuring a state of the vehicle and a state of the aftertreatment system to determine the fraction of an engine-on time.

8. The method of claim 7 further comprising providing trip information to determine the fraction of an engine-on time.

9. The method of claim 1 wherein the aftertreatment condition threshold depends on a state of an exhaust aftertreatment system.

10. The method of claim 1 wherein the engine is a diesel engine.

11. The method of claim 1 wherein the aftertreatment procedure is a diesel particulate filter regeneration.

12. The method of claim 1 wherein the engine-on request is based on a vehicle power demand.

13. The method of claim 1 wherein the engine-on request is based on a battery state of charge requirement.

14. The method of claim 1 further comprising performing an exhaust aftertreatment procedure for the vehicle while operating the engine when the engine-on request is based on an aftertreatment system requirement.

15. A vehicle comprising:

a compression ignition engine having an exhaust aftertreatment system; and

a controller electronically coupled to the engine wherein the controller is configured to;

(i) operate the engine based on an engine-on request, and (ii) perform an exhaust aftertreatment procedure for the vehicle when an engine-on fraction for a designated time is greater than an aftertreatment condition threshold.

16. The vehicle of claim 15 wherein the exhaust aftertreatment system is a diesel particulate filter.

17. The vehicle of claim 15 wherein the controller is configured to determine the engine-on fraction from an engine-on time and a time to complete the aftertreatment procedure.

18. The vehicle of claim 15 further comprising an electric machine.

19. The vehicle of claim 18 wherein the engine is coupled to the electric machine using an upstream clutch, and the electric machine is coupled to a transmission using a downstream clutch;

and

wherein the engine, the electric machine, and the transmission are arranged sequentially.

20. A computer readable medium having stored data representing instructions executable by a controller to control a vehicle, comprising:

instructions for operating the engine based on an engine-on request; and

instructions for performing an exhaust aftertreatment procedure for the vehicle when an engine-on time fraction is greater than an aftertreatment condition threshold.