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AssigneesSaturn Corporation, Delco Electronics Corporation
InventorsDavid C. Muscaro, Larry T. Nitz, Michael R. Witkowski
Estimating the term…
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.
In a motor vehicle including a fuel-injected engine and an automatic shift transmission having a fluid-operated torque transmitting device which is filled in preparation for engagement and then engaged to establish a vehicle drive condition in response to movement of a driver-operated range selector, a method of operation which avoids engine speed disturbances associated with the establishment of said vehicle drive condition, comprising the steps of:
Dependencies are inferred from the claim text.