Diagnostic method for a compressor recirculation valve

Patent metadata

Field	Value
Publication number	US-2016160746-A1
Application number	US-201414565098-A
Country	US
Kind code	A1
Filing date	Dec 9, 2014
Priority date	Dec 9, 2014
Publication date	Jun 9, 2016
Grant date	—

Abstract

Methods are provided for identifying degradation in components of a compressor recirculation valve (CRV). One method includes differentiating between degradation of a throttle of the CRV and a position sensor of the CRV based on each of a throttle inlet pressure and commanded position of the throttle of the CRV. The method also includes utilizing output from the position sensor of the CRV in response to the commanded position of the throttle of the CRV.

First claim

1 . A method for a boosted engine, comprising:
differentiating between degradation of a throttle of a compressor recirculation valve (CRV) and a position sensor of the CRV based on each of a throttle inlet pressure and commanded position of the throttle of the CRV.

2 . The method of claim 1 , wherein the differentiating between degradation of the throttle of the CRV and the position sensor of the CRV is further based on an output from the position sensor of the CRV in response to the commanded position of the throttle of the CRV.

3 . The method of claim 2 , wherein the throttle inlet pressure is measured upstream of an intake throttle positioned in an intake passage of the boosted engine.

4 . The method of claim 3 , further comprising indicating degradation of the position sensor based on a change in throttle inlet pressure responsive to a commanded change in a position of the throttle of the CRV and a lack of change in a response of the position sensor responsive to the commanded change in the position of the throttle of the CRV.

5 . The method of claim 4 , further comprising deactivating the CRV in response to the indicating of degradation of the position sensor of the CRV.

6 . The method of claim 5 , further comprising adjusting one or more of a wastegate, an intake throttle, and variable cam timing in response to the deactivating of the CRV.

7 . The method of claim 3 , further comprising indicating degradation of the throttle of the CRV based on a lack of change in a response of the position sensor responsive to a commanded change in a position of the throttle of the CRV and a lack of change in throttle inlet pressure responsive to the commanded change in the position of the throttle of the CRV.

8 . The method of claim 7 , wherein degradation of the throttle of the CRV includes one of the throttle being stuck open, the throttle being stuck closed, the throttle being partially stuck open, and the throttle being partially stuck closed.

9 . The method of claim 1 , wherein the CRV is a continuously variable compressor recirculation valve.

10 . A method, comprising:
actuating a continuously variable compressor recirculation valve (CCRV); indicating degradation of the CCRV based on feedback from a position sensor of the CCRV indicating a throttle of the CCRV did not change position upon actuation; and differentiating between degradation of the throttle of the CCRV and the position sensor of the CCRV.

11 . The method of claim 10 , wherein the differentiating between degradation of the throttle of the CCRV and the position sensor of the CCRV is based on a throttle inlet pressure, the throttle inlet pressure measured by a sensor positioned upstream of an intake throttle and downstream of an intake compressor.

12 . The method of claim 11 , wherein the differentiating between degradation of the throttle of the CCRV and the position sensor of the CCRV is further based on a commanded change in CCRV position, an expected change in throttle inlet pressure, and feedback from the position sensor of the CCRV.

13 . The method of claim 12 , further comprising indicating degradation of the position sensor based on an increase in throttle inlet pressure in response to the CCRV being commanded to a closed position and feedback from the position sensor indicating the CCRV is open.

14 . The method of claim 12 , further comprising indicating degradation of the position sensor based on a decrease in throttle inlet pressure in response to the CCRV being commanded to an open position and feedback from the position sensor indicating the CCRV is closed.

15 . The method of claim 12 , further comprising indicating degradation of the throttle of the CCRV based on a lack of change in throttle inlet pressure in response to the CCRV being commanded to a closed position and feedback from the position sensor indicating the CCRV is open.

16 . The method of claim 12 , further comprising indicating degradation of the throttle of the CCRV based on a lack of change in throttle inlet pressure in response to the CCRV being commanded to an open position and feedback from the position sensor indicating the CCRV is closed.

17 . A system, comprising:
an engine; a turbocharger for providing a boosted aircharge to the engine, the turbocharger including an exhaust turbine and an intake compressor; an intake throttle positioned in an intake passage downstream of the intake compressor; a wastegate coupled across the exhaust turbine; a continuously variable recirculation valve (CCRV) coupled across the intake compressor, the CCRV including a CCRV throttle and a CCRV position sensor; a throttle inlet pressure sensor coupled to the intake passage upstream of the intake throttle and downstream of the intake compressor; and a control system with computer-readable instructions stored on non-transitory memory for:
actuating a change in position of the CCRV;
determining degradation of the CCRV based on feedback from the CCRV position sensor indicating the CCRV throttle did not change position in response to the actuating; and
during a first condition, indicating degradation of the CCRV position sensor; and
during a second condition, indicating degradation of the CCRV throttle.

18 . The system of claim 17 , wherein the first condition includes an expected change in throttle inlet pressure measured by the throttle inlet pressure sensor in response to the actuating, and wherein the second condition includes substantially no change in throttle inlet pressure measured by the throttle inlet pressure sensor.

19 . The system of claim 17 , wherein the control system includes further instructions for deactivating the CCRV in response to the determining of degradation of the CCRV.

20 . The system of claim 19 , wherein the control system includes further instructions for adjusting one or more of the wastegate, the intake throttle, and valve timing in response to the deactivating of the CCRV.

Assignees

• Ford Global Tech Llc

Inventors

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

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F02B37/183 Primary

  Arrangements of bypass valves or actuators therefor · CPC title

• G01L27/007

  Malfunction diagnosis, i.e. diagnosing a sensor defect · CPC title

• F02D41/0007 Primary

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

• F04D27/0215

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