Manifold volume determination based on surge frequency

Patent metadata

Field	Value
Publication number	US-10190512-B2
Application number	US-201514939790-A
Country	US
Kind code	B2
Filing date	Nov 12, 2015
Priority date	Nov 12, 2015
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

Methods and systems are provided for determining a cylinder air charge based on a boost manifold volume of an engine. In one example, a method may include inducing a compressor surge event, and updating the boost manifold volume in response to a difference between an actual surge pressure and an expected surge pressure. The method further includes determining the cylinder air charge based on the updated boost manifold volume.

First claim

The invention claimed is:

1. A method for an engine comprising:
calculating an expected surge frequency via a model-based diagnostic utilizing a known boost manifold volume;
calculating an actual surge frequency based on an output of a pressure sensor;
updating the known boost manifold volume to an updated boost manifold volume based on a difference between the expected surge frequency and the actual surge frequency; and
adjusting engine operating parameters responsive to the updated boost manifold volume, where adjusting the engine operating parameters includes one or more of adjusting a fuel injector actuator and adjusting a position of a throttle.

2. The method in claim 1 , where the engine operating parameters include one or more of a fuel injection amount, an intake mass airflow, and a boost pressure.

3. The method of claim 1 , further comprising inducing a compressor surge event.

4. The method of claim 3 , wherein the compressor surge event is induced when an operator tips-out of an accelerator pedal.

5. The method of claim 3 , wherein the compressor surge event is induced when a noise level of a vehicle is higher than a threshold.

6. The method of claim 1 , wherein the actual surge frequency is determined by estimating a frequency of oscillations of a boost pressure from the output of the pressure sensor, and wherein the pressure sensor is coupled downstream of a compressor.

7. The method of claim 1 , wherein the actual surge frequency is determined by estimating a frequency of oscillations of a compressor mass flow from an output of a compressor flow sensor, the compressor mass flow sensor coupled downstream of a compressor.

8. The method of claim 1 , wherein the actual surge frequency is determined by estimating a frequency component of a surge amplitude.

9. The method of claim 1 , wherein the model-based diagnostic further utilizes a boost pressure and an intake air temperature.

10. The method of claim 9 , wherein the intake air temperature is measured with a temperature sensor coupled to an intake boost chamber of the engine.

11. A method for an engine comprising:
during a compressor surge event,
determining an actual surge frequency based on an output of a pressure sensor;
determining a boost manifold volume based on the actual surge frequency, a manifold boost pressure, and an intake air temperature;
determining a cylinder air charge based on the boost manifold volume; and
adjusting engine operating parameters based on the cylinder air charge, where adjusting the engine operating parameters includes adjusting one or more of a fuel injector actuator and a position of a throttle plate.

12. The method of claim 11 , wherein the compressor surge event is induced while discharging a fuel vapor.

13. The method of claim 11 , wherein the compressor surge event is induced when an air-to-fuel ratio of the engine is rich.

14. The method of claim 11 , wherein the compressor surge event is induced when a vehicle is traveling on a rough road.

15. The method of claim 11 , wherein the compressor surge event is induced by operating one more of a wastegate and a compressor bypass valve.

16. The method of claim 11 , further comprising terminating the compressor surge event in response to determining the actual surge frequency.

17. An engine system comprising:
a turbocharger includes a compressor and a turbine;
a compressor bypass valve for controlling a speed of the compressor;
a wastegate for controlling a speed of the turbine;
a pressure sensor coupled downstream of the compressor for sensing a boost pressure;
a temperature sensor coupled to an intake boost chamber of an engine system for sensing an intake air temperature; and
a controller configured with computer readable instructions stored on non-transitory memory for:
inducing a compressor surge event;
calculating an actual surge frequency based on an output of the pressure sensor;
determining an expected surge frequency via a model-based diagnostic utilizing a known boost manifold volume;
updating the known boost manifold volume to an updated boost manifold volume based on a difference between the actual surge frequency and the expected surge frequency; and
adjusting engine operating parameters responsive to the updated boost manifold volume, where adjusting the engine operating parameters includes one or more of adjusting a fuel injector actuator and a position of a throttle plate.

18. The engine system of claim 17 , wherein the model-based diagnostic further utilizes the boost pressure and the intake air temperature.

19. The engine system of claim 17 , wherein the controller is configured for inducing the compressor surge event by decreasing an opening of one or more of the wastegate and the compressor bypass valve.

20. The engine system of claim 17 , wherein the controller is further configured for determining a cylinder air charge responsive to the updated boost manifold volume.

Assignees

• Ford Global Tech Llc

Inventors

• Xiao Baitao
• Ossareh Hamid-Reza
• Banker Adam Nathan

Classifications

• F02B37/162

  by bypassing, e.g. partially, intake air from pump inlet to pump outlet · CPC title

• F02D29/04

  peculiar to engines driving pumps · CPC title

• F02D41/182

  for the control of a fuel injection device · CPC title

• F02D41/2438

  Active learning methods · CPC title

• F02D41/0007 Primary

  for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12) · CPC title