F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
341/68
F15B 18/00 (2006.01) B62D 11/04 (2006.01) B62D 11/18 (2006.01) F16H 61/46 (2006.01)
Patent
CA 1039832
ELECTRICAL HYDROSTATIC TRANSMISSION CONTROL SYSTEM Abstract of the Disclosure: An improved apparatus is provided to control the operation of a plurality of hydrostatic trans- missions which are advantageously utilized to drive the tracks of a vehicle. This apparatus includes a signal generator which provides an electrical ratio command signal which is variable to correspond to any one of a plurality of displace- ments and output speeds of a pair of hydrostatic transmissions. Right and left steering command signal generators are selectively operable to provide electrical steering command signals which effect operation of actuator assemblies to vary the output speed of one of the hydrostatic transmissions relative to the other hydrostatic transmission to turn the vehicle. A straight tracking control apparatus includes a pair of speed sensing units which are effective to provide electrical speed signals which vary in value as a function of variations in the output speed of an associated hydrostatic transmission. During movement of the vehicle along a straight path, the electrical speed signals are compared and utilized to effect activation of one or more of the actuator assemblies if the output speed of one of the transmissions is different from the output speed of the other transmission. Upon actuation of the steering controls, the straight tracking apparatus is rendered ineffective so that the vehicle can be turned. Anti-stall circuitry is provided to prevent overloading of the engine.
233651
Cornell Charles R.
O'callaghan Gerald F.
Corporation Eaton
Na
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