Closed loop control system for hydrostatic transmission

Details Closed loop control system for hydrostatic transmission Closed loop control system for hydrostatic transmission

F - Mech Eng,Light,Heat,Weapons

15

B

138/41.15

F15B 9/14 (2006.01) F16H 61/46 (2006.01)

Patent

CA 1037822

CLOSED LOOP CONTROL SYSTEM FOR HYDROSTATIC TRANSMISSION ABSTRACT A hydrostatic transmission for accelerating, driving and braking a high inertia load, such as the swing mechanism of a power shovel or crane, includes an engine-driven swashplate-type variable displacement constant speed reversible main hydraulic pump coupled in a closed loop circuit to a swashplate-type fixed displacement variable speed reversible hydraulic motor. A pair of control lever operated pilot pressure modulated pump displacement control valves selectively direct control fluid from an engine-driven fixed displace- ment constant speed charge pump to the stroking pistons of the servo control cylinders on the main pump to thereby control motor direction and speed. The charge pump also supplies replenishing fluid to the main pump/motor circuit through replenishing check valves. A network of three flow control valves is connected across the main pump/motor circuit and to the charge pump outlet to measure the fluid pressure drop across the motor and thus provide a torque feedback signal to modulate the control valves and thereby maintain maximum motor torque for the control lever position selected. A balancing signal is also transmitted from the charge pump to further modulate the control valves and thereby render them insensitive to variations in charge pump pressure appearing in the torque feedback signal.

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