Adapting indicated engine torque during regeneration of a diesel particulate filter

• US 8,042,325 B2
• Filed: 11/01/2007
• Issued: 10/25/2011
• Est. Priority Date: 11/01/2007
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Ike, Cristina, Dillon, Dave M., Cicala, Stephen M., Polk, Michael, Kucharski, Joseph, Suter, Charles W., Riedle, Bradley D.
• Primary Examiner(s): Nguyen; Tu M.
• Assistant Examiner(s): TRAN, DIEM T
• Application Number:
  US11/933,598
• Publication Number:
  US 20090118993A1
• Time in Patent Office: 1,454 Days
• Field of Search: 602/74, 602/85, 602/95, 602/97, 603/11
• US Class Current: 60/285
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/0676 Engine temperature
• CPC Class Codes: B60W 2510/0695 Inertia
• CPC Class Codes: B60Y 2300/476 Regeneration of particle filters
• CPC Class Codes: F02D 2041/1433 using a model or simulation of the system
• CPC Class Codes: F02D 2200/023 Temperature of lubricating oil or working fluid
• CPC Class Codes: F02D 2400/12 Engine control specially adapted for a transmission comprising a torque converter or for continuously variable transmissions
• CPC Class Codes: F02D 41/023 in relation with the gear ratio shifting conjoint control for improving gear change B60W30/19
• CPC Class Codes: F02D 41/029 the exhaust gas treating apparatus being a particulate filter
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine
• CPC Class Codes: F16H 59/14 Inputs being a function of torque or torque demand

Abstract

In a motor vehicle powertrain that includes a diesel engine, a particulate filter and a torque converter, a method for correcting an indicated engine output torque includes estimating a magnitude of torque being transmitted from the engine to the torque converter while regenerating the particulate filter, determining a reference magnitude of current engine torque being produced while regenerating the particulate filter, determining a torque error from a difference between the estimated magnitude and the reference magnitude, recording the torque error, determining a current torque error from the recorded torque error using a current engine speed and a current reference engine torque as indices to the recorded engine toque error, producing a corrected engine torque from the sum of the current torque error and the current reference engine torque, and using the corrected engine torque to control operation of the transmission.

Claims

1. In a motor vehicle powertrain that includes a diesel engine, a particulate filter and a torque converter, a method for correcting an indicated engine output torque comprising the steps of:

(a) using a engine speed and a torque converter constant to estimate a first magnitude of torque being transmitted from the engine to the torque converter while regenerating the particulate filter and a second magnitude of torque being transmitted from the engine to the torque converter while no regeneration of the particulate filter occurs;

(b) using engine parameters to determine a first reference magnitude of current engine torque being produced while regenerating the particulate filter and a second reference magnitude of current engine torque being produced while no regeneration of the particulate filter occurs;

(c) determining a first torque error from a difference between the first estimated magnitude and the first reference magnitude, and a second torque error from a difference between the second estimated magnitude and the second reference magnitude;

(d) recording the first and second torque errors with reference to the engine speed, the reference magnitude, and the mode of regeneration at which the torque error is determined;

(e) determining a differential torque error from the recorded first and second torque errors using a current engine speed, a current reference engine torque and a current mode of regeneration;

(f) producing a corrected engine torque from a sum resulting from the current reference engine torque and the differential torque error; and

(g) using the corrected engine torque to control operation of the transmission.

2. The method of claim 1 wherein:

step (d) further comprises recording the torque error with reference to a engine coolant temperature at which the torque error is determined; and

step (e) further comprises determining a differential torque error from the recorded torque errors using a current engine speed, a current reference engine torque, and a current an engine coolant temperature as indices to the recorded engine torque errors.

3. The method of claim 1 wherein the powertrain includes a transmission pump and step (a) further comprises using a engine speed, a torque converter constant, and a magnitude of torque being transmitted from the engine to the transmission pump to estimate a magnitude of torque being transmitted from the engine to the torque converter.

4. The method of claim 1 wherein the powertrain includes a transmission pump and step (a) further comprises using an engine speed, a torque converter constant, a magnitude of torque being transmitted from the engine to the transmission pump, and a magnitude of engine rotating inertia to estimate a magnitude of torque being transmitted from the engine to the torque converter.

5. A method for correcting indicated engine output torque, comprising:

(a) using engine speed and a torque converter constant to estimate a first torque magnitude transmitted from a diesel engine to a torque converter while regenerating a particulate filter and a second torque magnitude of torque transmitted from a diesel engine to a torque converter while said regeneration does not occur;

(b) using engine parameters to determine a first reference engine torque produced while regenerating said filter and a second reference engine torque produced while said regeneration does not occur;

(c) determining a first torque error from a difference between the first estimated magnitude and the first reference magnitude, and a second torque error from a difference between the second estimated magnitude and the second reference magnitude;

(d) recording the first and second torque errors with reference to the engine speed, the reference magnitude, and the mode of regeneration at which the torque error is determined;

(e) determining a differential torque error from the recorded first and second torque errors using a current engine speed, a current reference engine torque and a current mode of regeneration;

(f) producing a corrected engine torque from a sum of the current reference engine torque and the differential torque error; and

(g) using the corrected engine torque to control operation of the transmission.

6. The method of claim 5 wherein:

step (d) further comprises recording the torque error with reference to a engine coolant temperature at which the torque error is determined; and

step (e) further comprises determining a differential torque error from the recorded torque errors using a current engine speed, a current reference engine torque, and a current an engine coolant temperature as indices to the recorded engine torque errors.

7. The method of claim 5 wherein the powertrain includes a transmission pump and step (a) further comprises using a engine speed, a torque converter constant, and a magnitude of torque being transmitted from the engine to the transmission pump to estimate a magnitude of torque being transmitted from the engine to the torque converter.

8. The method of claim 5 wherein the powertrain includes a transmission pump and step (a) further comprises using an engine speed, a torque converter constant, a magnitude of torque being transmitted from the engine to the transmission pump, and a magnitude of engine rotating inertia to estimate a magnitude of torque being transmitted from the engine to the torque converter.