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Apparatus and method of abnormality diagnosis for supercharging pressure control system

  • US 7,677,227 B2
  • Filed: 07/03/2006
  • Issued: 03/16/2010
  • Est. Priority Date: 07/04/2005
  • Status: Active Grant
First Claim
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1. An abnormality diagnosis apparatus for a supercharging pressure control system including a throttle valve located in an intake system to adjust an intake air quantity, a supercharger located upstream of the throttle valve in the intake system to supercharge intake air, and a bypass valve located in a passage bypassing the supercharger in the intake system, the bypass valve being opened when a predetermined operating condition is established, the abnormality diagnosis apparatus comprising:

  • a pressure monitoring means which monitors a pressure upstream of the throttle valve over a period of time; and

    an abnormality determination means which determines whether or not there occurs abnormality of the bypass valve based on the pressure monitored by the pressure monitoring means after the operating condition is established with the throttle valve fully closed.

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