Motor vehicles – Steering by driving – Independently operable drive motors
Patent
1975-11-03
1977-05-17
Peters, Jr., Joseph F.
Motor vehicles
Steering by driving
Independently operable drive motors
60395, B62D 1104, F15B 1800
Patent
active
040236374
ABSTRACT:
In a vehicle wherein power is applied to each track or wheel through a hydrostatic transmission and control system including: a displacement control unit for regulating each transmission; a steering control valve associated with each displacement control unit for modifying the operation of the displacement control unit; and a speed and direction control unit for applying hydraulic pressure to each of the displacement control units for controlling the basic direction and speed of the vehicle; wherein the maintenance of the desired direction of operation of the vehicle is enhanced by an electronic tracking control circuit that includes: means for measuring the actual speed of each track; a phase comparator for providing a signal indicating the difference in track speeds; an integrator for providing a signal proportional to the difference in speed as measured over time; and comparator circuits responsive to the integrator for triggering a solenoid control valve connected between the appropriate steering control valve and displacement control unit to open, thereby reducing the speed of the faster moving track in order to maintain the desired direction of operation. Either a straight line or curved path of operation for the vehicle can be selected by adjusting bias voltages applied to the integrator. Additional circuitry is provided to deactivate the electronic tracking control when either of the steering control valves is actuated.
REFERENCES:
patent: 3438201 (1969-04-01), Nash
patent: 3848690 (1974-11-01), Hawkins
patent: 3885388 (1975-05-01), Crull
patent: 3914938 (1975-10-01), Cornell
Killingsworth Ted E.
McMurry Michael B.
Peoples William R.
Peters Jr. Joseph F.
Schrecengost R.
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