End of fill detector for a hydraulic clutch

Details End of fill detector for a hydraulic clutch End of fill detector for a hydraulic clutch

1993-03-23

1994-09-06

Braun, Leslie A.

192 clutches and power-stop control

Clutches

Operators

192109F, 13762564, 91361, 361159, F16D 2514, F15B 1300

Patent

active

053439945

ABSTRACT:
An apparatus and method are adapted for detecting an end-of-fill condition of an actuator having a varying control volume is provided. The end-of-fill condition corresponds to the varying control volume being pressurized to a predetermined end-of-fill pressure. The apparatus comprises a solenoid having a coil and an armature. The armature is movable relative to the coil in response to energization of the coil. A valve delivers a flow of fluid to the actuator. The fluid flow having a rate responsive to the movement of the armature. The apparatus and method controllably energizes the coil with a control current. The apparatus and method detects a flyback current in the coil, detects a change in the level of noise in said flyback current, and responsively producing an end-of-fill signal in response to the change being greater than a predetermined threshold.

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patent: 4871048 (1989-10-01), Chatterjea
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patent: 4949264 (1990-08-01), Katayama et al.
patent: 5054599 (1991-10-01), Marcott
Komatsu Technical Guide, "K-Atomics Komatsu-Advanced Transmission with Optimum Modulation Control," 1989.
Article entitled "The Fast Wavelet Transform: Beyond Fourier Transforms" from Dr. Dobb's Journal dated Apr. 1922 vol. 17 No. 4 p. 16(9) by Mac A. Cody.

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