Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Transmission control
Patent
1995-10-19
1998-12-01
Nguyen, Tan Q.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Transmission control
701 56, 701 55, 74335, 477 78, B60K 4118
Patent
active
058452249
ABSTRACT:
A control system for shifting a vehicle transmission, such as in work vehicles, tractors and the like, includes sensors for detecting the output speed of the vehicle engine, the output speed of the transmission and the vehicle ground speed. Command devices are available to the vehicle operator for generating command signals, such as for commanding the direction of movement of the vehicle, as well as forward and reverse gear ratios. A controller receives signals from the sensors and command devices and controls engagement and disengagement of combinations of fluid clutches in the transmission to obtain desired gear ratios between the transmission input and output shafts. The control system permits independent preselection of forward and reverse gear ratios through separate forward and reverse gear ratio preselection routines. The preselected gear ratios are stored in a memory circuit and are used as target ratios for shifting the transmission from neutral or in shuttle shifting between forward and reverse gear ratios. Both the forward and reverse gear ratios are visually displayed during normal operation of the vehicle, providing the operator continually with an indication of the gear ratio to which the transmission will be shifted.
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Case Corporation
Nguyen Tan Q.
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