Interrelated power delivery controls – including engine control – Transmission control – Plural outputs
Patent
1994-05-05
1996-06-04
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Plural outputs
477109, 180247, B60K 17354, B60K 4104
Patent
active
055227775
ABSTRACT:
The invention is directed to a four-wheel drive system for a vehicle having front and rear drive wheels driven by an engine and transmission assembly, and including a transfer case having a torque input shaft for receiving output torque from the vehicle engine and transmission assembly. A transfer gear assembly of the transfer case provides low and high speed power paths, and a shift mechanism is provided to shift between the low and high speed power paths. The system further includes an engine control module for controlling the engine fuel system and shifting of the transmission assembly between a plurality of vehicle gear ratios. A transfer case control module controls the shift mechanism for shifting between the low and high speed power paths. The transfer case control module is connected to the engine control module, and controls shifting between the low and high speed power paths by selectively controlling the engine fuel system to modify torque supplied to the transfer case, and/or shifting of the transmission assembly. The transfer case control module will thereafter shift the transfer case to a selected high or low speed power path when the output speed of the transmission assembly matches the output speed of the transfer case. The system allows the transfer case to be shifted from low range to high range or vice versa on-the-fly, while the vehicle is still moving and under power. The invention also provides a method of shifting a four-wheel drive system between low range and high range drive modes on-the-fly.
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Baxter Ralph W.
Sommer Randy L.
Dana Corporation
Ta Khoi Q.
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