Diagnostic method for a compressor recirculation valve

Patent metadata

Field	Value
Publication number	US-10208657-B2
Application number	US-201715853130-A
Country	US
Kind code	B2
Filing date	Dec 22, 2017
Priority date	Dec 9, 2014
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

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

The invention claimed is:

1. 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.

2. The system of claim 1 , 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.

3. The system of claim 1 , wherein the control system includes further instructions for deactivating the CCRV in response to the determining of degradation of the CCRV.

4. The system of claim 3 , 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

• F02B37/183 Primary

  Arrangements of bypass valves or actuators therefor · CPC title

• F02D2200/0406

  Intake manifold pressure · CPC title

• Y02T10/144

  Cross-Sectional Technologies · mapped topic

• F02D41/0007 Primary

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

• F02B37/16 Primary

  by bypassing charging air · CPC title