Methods and systems for detecting compressor recirculation valve faults

• US 9,810,229 B2
• Filed: 12/08/2014
• Issued: 11/07/2017
• Est. Priority Date: 12/08/2014
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Banker, Adam Nathan, Xiao, Baitao, Ossareh, Hamid-Reza
• Primary Examiner(s): Wongwian, Phutthiwat
• Assistant Examiner(s): Kebea, Jessica
• Application Number:
  US14/563,841
• Publication Number:
  US 20150096296A1
• Time in Patent Office: 1,065 Days
• CPC Class Codes: F02B 37/12 Control of the pumps
• CPC Class Codes: F02D 2021/083 controlling exhaust gas recirculation electronically
• CPC Class Codes: F02D 2041/001 for engines with variable valve actuation
• CPC Class Codes: F02D 23/02 the engines being of fuel-injection type
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 41/221 relating to the failure of actuators or electrically driven elements
• CPC Class Codes: F02M 26/08 for engines having two or more intake charge compressors or exhaust gas turbines, e.g. a turbocharger combined with an additional compressor
• CPC Class Codes: F04D 17/10 for compressing or evacuating
• CPC Class Codes: F04D 27/001 Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
• CPC Class Codes: F04D 27/0215 Arrangements therefor, e.g. bleed or by-pass valves
• CPC Class Codes: F04D 27/0223 Control schemes therefor
• CPC Class Codes: F04D 27/023 Details or means for fluid extraction
• CPC Class Codes: F05D 2220/40 in turbochargers
• CPC Class Codes: F05D 2260/80 Diagnostics
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

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.

Claims

1. An engine operating method comprising:

globally adapting a compressor surge line stored in non-transitory memory of an engine controller;

via the engine controller,

responsive to the global adaptation being a first global adaptation including the compressor surge line being advanced beyond an advance limit, indicating degradation of a compressor recirculation valve (CRV) the degradation of the CRV comprising a CRV opening being more than a desired CRV opening; and

responsive to the global adaptation being a second global adaptation including the compressor surge line being retarded beyond a retard limit, indicating degradation of the CRV, the degradation of the CRV comprising a CRV opening being less open than the desired CRV opening.

2. The engine operating method of claim 1, wherein the advance limit and the retard limit are based on an expected lifetime of an intake system of the engine including a turbo compressor, a turbine and the CRV compressor recirculation.

3. The engine operating method of claim 1, wherein globally adapting the surge line includes retarding the compressor surge line in response to a number of compressor surge events greater than a threshold number of compressor surge events, and advancing the compressor surge line in response to a number of tip-out events greater than a threshold number of tip-out events.

4. The engine operating method of claim 3, wherein each of the number of compressor surge events is detected based on a frequency content of a signal output from a throttle inlet pressure sensor being greater than a threshold.

5. The engine operating method of claim 3, wherein each of the number of tip-out events is greater than a threshold amount, and wherein the compressor is not surging during each of the number of tip-out events.

6. The engine operating method of claim 5, wherein retarding the compressor surge line includes adjusting the compressor surge line to a left side of an initial compressor surge line, and wherein advancing the compressor surge line includes adjusting the compressor surge line to a right side of the initial compressor surge line.

7. An engine operating method, comprising:

globally adapting a compressor surge line stored in memory of an engine controller;

via the engine controller,

responsive to the global adaptation being a first global adaptation including the compressor surge line being advanced beyond an advance limit, indicating degradation of a compressor recirculation valve (CRV) the degradation of the CRV comprising a CRV opening being more than a desired CRV opening; and

responsive to the global adaptation being a second global adaptation including the compressor surge line being retarded beyond a retard limit indicating degradation of the CRV, the degradation of the CRV comprising the CRV opening being less open than the desired CRV opening,

wherein globally adapting the surge line includes retarding the compressor surge line in response to a number of compressor surge events greater than a threshold number of compressor surge events, and advancing the compressor surge line in response to a number of tip-out events greater than a threshold number of tip-out events.