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Diagnostic method for a compressor recirculation valve

  • US 9,702,298 B2
  • Filed: 12/09/2014
  • Issued: 07/11/2017
  • Est. Priority Date: 12/09/2014
  • Status: Active Grant
First Claim
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1. A method for a boosted engine, comprising:

  • sending, via an electronic controller, a periodic signal command to a compressor recirculation valve (CRV) comprising a square waveform;

    distinguishing between degradation of a position sensor of the CRV and a throttle of the CRV based on changes in pressure at an inlet of an intake throttle in response to the square waveform periodic signal command; and

    in response to the degradation of the throttle of the CRV, adjusting a position of a wastegate valve.

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