Apparatuses, methods, systems, and techniques for improving the accuracy of internal combustion engine torque determinations

Patent metadata

Field	Value
Publication number	US-12038052-B2
Application number	US-202217813612-A
Country	US
Kind code	B2
Filing date	Jul 20, 2022
Priority date	Jan 31, 2020
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

A system comprises a powertrain including an engine configured to output torque to a driveline, and an electronic control system operatively coupled with the powertrain. The electronic control system is configured to determine an engine torque value, and control a component of the driveline in response to the engine torque value. The engine torque value may account for an effect of air-fuel ratio (AFR) on engine torque. The engine torque value may account for an effect of charge transport delay on engine torque.

First claim

The invention claimed is:

1. A system comprising:
a powertrain including an engine configured to output torque to a driveline; and
an electronic control system operatively coupled with the powertrain and configured to
determine an engine torque value in response to an air-fuel ratio (AFR) parameter and an engine acceleration parameter to account for an effect AFR on engine torque and an effect of engine acceleration on AFR, and
control a component of the driveline in response to the engine torque value.

2. The system of claim 1 wherein the electronic control system is configured to account for the effect of AFR on engine torque and the effect of engine acceleration on AFR using controls configured to
determine an AFR value using an intake air flow value and a commanded fueling value,
determine an engine acceleration value,
determine an AFR adjustment value using the AFR value and the engine acceleration value, and
determine the engine torque value using the AFR adjustment value and a steady state engine torque value.

3. The system of claim 2 wherein a magnitude of the AFR adjustment value is positively correlated with the engine acceleration value.

4. The system of claim 3 wherein at least one of: (a) the AFR value is filtered using a first order filter, and (b) the engine acceleration value is filtered using a first order filter.

5. The system of claim 1 wherein the accounting for an effect of air-fuel ratio (AFR) on engine torque and an effect of engine acceleration on AFR improves the accuracy of the engine torque value during transient operation of the engine.

6. The system of claim 1 wherein the engine torque value further accounts for an effect of transport delay on engine torque.

7. The system of claim 6 wherein the engine torque value accounts for the effect of transport delay using a filter which filters the engine torque value using a filter constant determined in response to a rate of change in commanded engine fueling and engine speed.

8. The system of claim 1 wherein one or both of:
(a) the engine torque value further accounts for an effect of powertrain inertia on engine torque, and
(b) the system includes an injector configured to inject fuel upstream of a plurality of cylinders of the engine and the engine torque value further accounts for an effect on engine torque of air-fuel charge mixture transport delay upstream of the engine's cylinders.

9. The system of claim 1 wherein the engine torque value is a net brake torque value indicating torque at an interface between the engine and a transmission component.

10. The system of claim 1 wherein the electronic control system is further configured to account for of one or more (a) an effect of pumping losses and an effect of an engine temperature on pumping losses, and (b) an effect of one or more of a mechanical load, a hydraulic load, a pneumatic load, and an electrical load on the engine.

11. A method comprising:
providing a system comprising a powertrain including an engine configured to output torque to a driveline, and an electronic control system operatively coupled with the powertrain; and
operating the electronic control system to perform the acts of:
determining an engine torque value in response to an air-fuel ratio (AFR) parameter and an engine acceleration parameter to account for an effect of AFR on engine torque and an effect of engine acceleration on AFR, and
controlling a component of the driveline in response to the engine torque value.

12. The method of claim 11 comprising operating the electronic control system to account for the effect of AFR on engine torque and an effect of engine acceleration on AFR by
determining an AFR value using an intake air flow value and a commanded fueling value,
determining an engine acceleration value,
determining an AFR adjustment value using the AFR value and the engine acceleration value, and
determining the engine torque value using the AFR adjustment value and a steady state engine torque value.

13. The method of claim 12 wherein a magnitude of the AFR adjustment value is positively correlated with the engine acceleration value.

14. The method of claim 13 wherein at least one of: (a) the AFR value is filtered using a first order filter, and (b) the engine acceleration value is filtered using a first order filter.

15. The method of claim 11 wherein the accounting for an effect of air-fuel ratio (AFR) on engine torque and an effect of engine acceleration on AFR improves the accuracy of the engine torque value during transient operation of the engine.

16. The method of claim 11 comprising operating the electronic control system to account for an effect of transport delay on engine torque.

17. The method of claim 16 wherein the engine torque value accounts for the effect of transport delay using a filter which filters the engine torque value using a filter constant determined in response to the rate of change in commanded engine fueling and engine speed.

18. The method of claim 11 comprising operating the electronic control system to account for an effect of powertrain inertia on engine torque.

19. The method of claim 11 wherein the engine torque value is a net brake torque value indicating torque at an interface between the engine and a transmission component.

20. The method of- claim 11 comprising operating the electronic control system to account for of one or more (a) an effect of pumping losses and an effect of an engine temperature on pumping losses, and (b) an effect of one or more of a mechanical load, a hydraulic load, a pneumatic load, and an electrical load on the engine.

Assignees

• Cummins Inc

Inventors

• Bellinger Steven M
• Karve Vasudev S
• Gujar Ajinkya A

Classifications

• F02D2200/1006

  Engine torque losses, e.g. friction or pumping losses or losses caused by external loads of accessories · CPC title

• F02D2200/1004

  Estimation of the output torque · CPC title

• F02D2041/1432

  the system including a filter, e.g. a low pass or high pass filter · CPC title

• F02D41/0052 Primary

  Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount · CPC title

• F16D2500/3067

  Speed of the engine · CPC title