Delco Electronics Corporation

Saturn Corporation

David C Muscaro

Larry T Nitz

Michael R Witkowski

In a motor vehicle power train including a fuel injected internal combustion engine and a hydraulic automatic transmission, an improved engine fueling control strategy for maintaining proper engine RPM in the presence of an automatic transmission Park or Neutral (P/N) to Drive or Reverse (D/R) range shifting. Communication between the Engine and Transmission Control Modules enables precise anticipation of rapid engine intake manifold absolute pressure (MAP) increases associated with P/N to D/R range shifting. Additional fuel is injected immediately preceding the MAP increase in order to maintain the proper engine air/fuel ratio necessary to prevent RPM sags and engine stalls during the clutch engagement. Once the clutch engagement is complete, the additional fuel is progressively eliminated.

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Troy, MI, United States of America

David C Muscaro