Location of piston position using radio frequency waves

Details Location of piston position using radio frequency waves Location of piston position using radio frequency waves

1989-07-10

1991-01-29

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

92 5R, 324635, 324644, F15B 1316

Patent

active

049878239

ABSTRACT:
An electrohydraulic control system includes an actuator having a cylinder and a piston variably positionable therewithin. An electrohydaulic valve is responsive to valve control signals for coupling the actuator to a source of hydraulic fluid. A coaxial transmission line extends through the actuator, and includes an outer conductor formed by the actuator cylinder and a center conductor operatively coupled to the piston, such that length of the coaxial transmission line is effectively directly determined by position of the piston within the cylinder. An rf generator is coupled to the coaxial transmission line for launching rf energy therewithin, and valve control electronics is responsive to rf energy reflected by the coaxial transmission line for indicating position of the piston within the cylinder and generating electronic control signals to the valve. A second coaxial transmission line of fixed length is connected the valve and actuator so that the hydraulic fluid flows therethrough. The rf energy is launched in the second transmission line and generator frequency is controlled as a function of phase angle at the second transmission line.

REFERENCES:
patent: 3589177 (1971-06-01), Merlo
patent: 4588953 (1986-05-01), Krase
patent: 4737705 (1988-04-01), Bitar et al.
patent: 4749936 (1988-06-01), Taplin
patent: 4757745 (1988-07-01), Taplin

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