Methods and systems for detecting compressor recirculation valve faults

Patent metadata

Field	Value
Publication number	US-10962019-B2
Application number	US-201715697608-A
Country	US
Kind code	B2
Filing date	Sep 7, 2017
Priority date	Dec 8, 2014
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

Methods are provided for identifying degradation in components of a compressor recirculation valve (CRV). One method may include inferring degradation of the CRV based on adaptation of a compressor surge line outside an expected range.

First claim

The invention claimed is:

1. A method for an engine, comprising:
indicating degradation of a compressor recirculation valve based on a surge line adaptation of a surge line on a compressor map stored in a controller of the engine being outside an expected range for surge line adaptation.

2. The method of claim 1 ,
wherein the surge line adaptation is learned over one or more drive cycles of the engine; and
wherein the expected range is defined by the left surge line boundary and the right surge line boundary.

3. The method of claim 2 , wherein learning the surge line adaptation includes learning a range of the surge line adaptations including a left surge line boundary and a right surge line boundary.

4. The method of claim 3 , wherein indicating degradation comprises indicating a compressor recirculation valve opening amount is less than a desired amount based on the surge line being adapted to a right side of the right surge line boundary.

5. The method of claim 4 , wherein indicating degradation comprises indicating the compressor recirculation valve opening amount is greater than the desired amount based on the surge line being adapted to a left side of the left surge line boundary.

6. The method of claim 3 , wherein the surge line adaptation is learned based on one or more of a compressor surge event, a number of surge events, a tip-out greater than a threshold amount and the compressor not surging during the tip-out, and a number of tip-outs, each tip-out greater than the threshold amount and the compressor not surging during each of the tip-outs.

7. The method of claim 6 , wherein the surge is detected based on a frequency of a throttle position sensor being greater than a threshold frequency, the sensor located downstream of the compressor.

8. The method of claim 6 , wherein the surge line is adapted to the left of an initial surge line in response to the number of tip-outs being greater than a threshold number of tip-outs.

9. The method of claim 6 , wherein the surge line is adapted to the right of an initial surge line in response to the number of surge events being greater than a threshold number of surge events.

10. An engine system comprising:
an engine;
a turbocharger for providing a boosted aft charge to the engine, the turbocharger including an exhaust turbine and an intake compressor;
a continuously variable recirculation valve coupled across the compressor;
a throttle coupled to the intake, downstream of the compressor; a throttle inlet pressure sensor located downstream of the compressor and upstream of the throttle; and
a controller with computer readable instructions for,
adapting a surge line of a compressor map stored in a memory of the controller based on at least one of a plurality of surge events and a plurality of tip-outs over one or more drive cycles of the engine; and
detecting degradation of the continuously variable recirculation valve based on the adaptation of the surge line.

11. The system of claim 10 , wherein the controller includes further instructions for indicating the recirculation valve is stuck closed in response to an area to the left of the surge line being greater than a first threshold area.

12. The system of claim 11 , wherein the controller includes further instructions for indicating the recirculation valve is stuck open in response to an area to the left of the surge line being less than a second threshold area.

Assignees

• Ford Global Tech Llc

Inventors

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

Classifications

• F02D41/0007

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

• F05D2260/80

  Diagnostics · CPC title

• F02D23/02

  the engines being of fuel-injection type · CPC title

• F04D27/0215

  Arrangements therefor, e.g. bleed or by-pass valves · CPC title

• F04D27/0223 Primary

  Control schemes therefor · CPC title