Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle subsystem or accessory control
Patent
1997-02-05
1999-09-07
Cuchlinski, Jr., William A.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle subsystem or accessory control
701 50, 180 644, 180 648, B62D 1110, B62D 1102
Patent
active
059480297
ABSTRACT:
A steering control system for a tracked vehicle includes an engine driven variable displacement steering pump which drives a hydraulic motor. The motor drives a differential drive mechanism which drives left and right track drive wheels. An electronic control unit, as a function of steering wheel position, vehicle speed, engine speed, forward/reverse vehicle direction and other parameters, generates a command signal which controls the swashplate of the steering pump. The system operates so that, for a given position of the steering wheel, a turn curvature of the vehicle decreases as vehicle speed increases, wherein turn curvature is inversely proportional to a radius of turn. This is accomplished by calculating a turn speed value equal to the vehicle speed multiplied by a ratio of a nominal engine speed divided by sensed engine speed, and by calculating the command signal equal to a steering gain value multiplied by a ratio of the turn speed value divided by a nominal vehicle speed value.
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US PAtent Application Serial No. 08/795,091, filed Feb. 5, 1997 (Attorney Docket 14644-US).
US Patent Application Serial No. 08/991,961, filed Dec. 17, 1997 (Attorney Docket 14524-US).
R. M. Ogorkiewicz, "Tank Steering Mechanisms", dated Mar. 10, 1967, The Engineer, pp. 381-383.
Cuchlinski Jr. William A.
Deere & Company
Donnelly Arthur D.
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