Operation control method for a frictional engagement element

Details Operation control method for a frictional engagement element Operation control method for a frictional engagement element

1988-04-15

1990-07-24

Gruber, Felix D.

Boots, shoes, and leggings

74866, 74868, 192 358, B60K 4118, B60K 4102, F16H 540

Patent

active

049439200

ABSTRACT:
An operation control method for a frictional engagement element which includes engaging means and piston means for urging the engaging means to engage, the operation of the piston means being controlled by means of pressurized oil supplied through a hydraulic control device for producing an oil pressure of the level corresponding to the quantity of electricity supplied thereto. The relationship between the quantity of electricity supplied to the hydraulic control device and the stroke speed of the piston means is previously stored. An ineffective stroke amount of the piston means is detected from the sum total of the products of drive periods, based on the quantities of electricity supplied to the hydraulic control device while the piston means travels through an ineffective stroke section, and stroke speeds corresponding individually to the quantities of electricity. The stored value of the ineffective stroke amount of the piston means is updated to store the detected ineffective stroke amount. When the piston means is moved through the ineffective stroke section, the period for the electric power supply to the hydraulic control device is monitored in accordance with the updated ineffective stroke amount, and the arrival of the piston means at the position just short of the engagement start position is detected.

REFERENCES:
patent: 4518068 (1985-05-01), Oguma et al.
patent: 4678069 (1987-07-01), Yoshimura et al.
patent: 4707789 (1987-11-01), Downs et al.
patent: 4760902 (1988-08-01), Bellanger
patent: 4763545 (1988-08-01), Shibayama et al.
patent: 4791568 (1988-12-01), Hiramatsu et al.

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