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

  • US 6,691,020 B2
  • Filed: 06/19/2001
  • Issued: 02/10/2004
  • Est. Priority Date: 06/19/2001
  • Status: Expired due to Fees
First Claim
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1. A system for optimizing a purge time for an emission control device located in the exhaust passage of an engine, during which an amount of a previously-stored constituent gas of the engine-generated exhaust gas is released from the device, the system comprising:

  • an oxygen sensor providing an output signal representative of the concentration of oxygen present in the exhaust flowing through the device during a sampling period; and

    a control module for detecting the peak voltage of the sensor output voltage, calculating a purge time correction factor related to the peak 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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