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Method and system for optimizing purge of exhaust gas constituent stored in an emission control device

  • US 20030004634A1
  • Filed: 06/19/2001
  • Published: 01/02/2003
  • Est. Priority Date: 06/19/2001
  • Status: Active Grant
First Claim
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1. A method of optimizing a purge time for an emission control device located in the exhaust passage of an engine upstream from an oxygen sensor, during which an amount of a previously-stored constituent gas of the engine-generated exhaust gas is released from the device, the method comprising:

  • detecting the sensor output voltage;

    calculating a purge time correction factor related to a characteristic of the sensor output voltage; and

    calculating a subsequent purge time as a function of the product of the correction factor and a present purge time.

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