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Automotive cold start fuel volatility compensation

  • US 6,079,396 A
  • Filed: 04/29/1998
  • Issued: 06/27/2000
  • Est. Priority Date: 04/29/1998
  • Status: Expired due to Term
First Claim
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1. An internal combustion engine air/fuel ratio control method, comprising the steps of:

  • sensing an engine startup operation;

    sampling an input signal indicating engine speed following the engine startup operation;

    estimating fuel volatility as a function of engine speed;

    identifying the estimated fuel volatility as one of a high volatility and a low volatility;

    modifying a correction value, by (a) increasing the correction value upon identifying the estimated fuel volatility as a low volatility, and (b) decreasing the correction value upon identifying the estimated fuel volatility as a high volatility;

    correcting an air/fuel ratio control command as a function of the modified correction value; and

    controlling engine air/fuel ratio in accordance with the corrected air/fuel ratio control command to provide for accurate engine air/fuel ratio control over a range of fuel volatilities.

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