Engine idle fuel control during transmission range shifting

Details Engine idle fuel control during transmission range shifting Engine idle fuel control during transmission range shifting

1992-10-14

1994-03-01

Braun, Leslie A.

Machine element or mechanism

Rotary driven device adjustable during operation relative to...

Screw and nut adjusting means

74866, 74857, 74860, B60K 4110

Patent

active

052897397

ABSTRACT:
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.

REFERENCES:
patent: 4542460 (1985-09-01), Weber
patent: 4760823 (1988-08-01), Yasuoka et al.
patent: 4819596 (1989-04-01), Yasuoka et al.
patent: 4838126 (1989-06-01), Wilfinger et al.
patent: 5157608 (1992-10-01), Sankpal et al.

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