Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Transmission control
Patent
1996-01-11
1999-06-29
Nguyen, Tan Q.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Transmission control
701 56, 701 61, 701 66, 192 358, 192 362, 74336R, B60K 4122
Patent
active
059162910
ABSTRACT:
A method and apparatus for shuttle shifting a power transmission are disclosed. The transmission is of the type including a plurality of intermeshing gears and a plurality of clutches associated with the gears. The clutches are engageable in predetermined combinations to place the transmission in various gear ratios. A control system permits the transmission to be shuttle shifted from forward to reverse gear ratios and vice versa, taking into account the vehicle speed and the target gear ratio to be engaged following the shuttle shift. If the shuttle shift request prior to expiration of a preset time following movement of a command device from a directional position, the transmission is placed in a neutral condition. If the vehicle speed is greater than a maximum allowable shuttle shifting speed upon request of the shuttle shift, the transmission is placed in a neutral condition. If the speed is not greater than the maximum allowable shuttle shifting speed, a controller compares the target gear ratio to a maximum allowable shuttle shifting gear ratio and completes the shuttle shift in different manners depending upon a predetermined relationship between the gear ratios. When a shuttle shift is aborted by the vehicle operator, a ground speed matching control routine is executed in which a gear ratio most closely matching a ratio between the engine speed and the vehicle ground speed is engaged prior to resumption of the commanded gear ratio.
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Case Corporation
Nguyen Tan Q.
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